The morning sun filtered through the paper screens, casting soft shadows across Kazuki's room. He sat alone on the edge of his futon, his hands trembling slightly as he stared at them—thin, pale, the hands of someone who'd been sick for most of his life.
Not my hands, a part of him thought. Takeshi's hands were soft from office work, but at least they had some proper substance. These... these are like thin sticks.
But they were his hands now. This was his body. His new life.
Kiku had left an hour ago to inform the family of his miraculous recovery. The servants had brought him food—rice porridge, pickled vegetables, weak tea, which sat untouched on a lacquered tray. Kazuki knew he should eat something. This body needed nutrition desperately. But first, he needed to understand exactly what he was working with.
He stood up slowly, testing his balance. The world swayed for a moment before he could steady himself. His legs felt like they might buckle at any second, but they held.
Twenty years old, he thought, drawing on Kazuki's memories. But I feel like eighty.
He slowly shuffled to the bronze mirror mounted on the wall, a luxury item, one of the few valuable possessions in this modest room. The face staring back was both familiar and alien to him.
Young. Undeniably handsome, with sharp features and clear skin despite the illness. Short black hair, slightly disheveled. Eyes that should have been dull with sickness but instead burned with an intensity that hadn't been there before.
Takeshi's intensity, he realized. My determination. In this body.
He examined himself more critically. His height—maybe 170 centimeters, average for this period. Weight was perhaps fifty kilograms at most, severely underweight. He could see his ribs through the thin sleeping robe. His arms were almost skeletal.
Scars marked his chest, remnants of childhood smallpox that nearly killed him at age seven. More scars on his arms and legs from various childhood injuries. This body had been fragile from birth, constantly struggling to survive.
But it did survive, Kazuki thought. Which means it's stronger than it actually looks. It just needs proper care now. Proper nutrition. Proper training.
He tested his range of motion. Arms raised above head, manageable, though his shoulders protested in pain. Squatting down was also possible, but his thighs screamed. His lungs—he took a deep breath and immediately started coughing, harsh and wet.
Respiratory damage from past illnesses. Maybe sixty, seventy percent lung capacity. That will severely limit cardio training.
But Takeshi's mind catalogued it all with clinical precision. In his previous life, he'd spent countless hours reading about physical fitness, nutrition, training regimens, never actually applying any of it to his own soft body, but the knowledge was there.
Progressive overload. Start with bodyweight exercises. Focus on compound movements. High protein diet to build muscle. Lots of rest for recovery. Six months, maybe a year, and this body can be functional. Two years and I could be formidable.
If he survived that long.
The door slid open without warning. Kazuki turned, instinctively dropping into a respectful posture as an elderly man entered.
Murata Gennosuke. The name surfaced from Kazuki's memories. Castle physician. Sixty-three years old. Had served the Matsudaira family since before Kazuki was even born. Traditional medicine practitioner who relied on herbal remedies, bloodletting, and prayer.
Medieval medicine, Takeshi's mind supplied with a mix of dread, disdain and resignation. This should be interesting.
"Young master," Murata said, his weathered face a mask of professional concern. "You should not be standing. You nearly died. Your body needs its due rest."
"I've been resting for two weeks," Kazuki replied. His voice was still hoarse, but stronger than it had been when he first woke. "And I'll die if I rest any longer. I need to move. To eat. To live."
Murata's eyes narrowed. "You sound... different."
Careful. Can't reveal too much.
"The fever changed me," Kazuki said simply. "I saw death looming above me, Murata-sensei. I came back different."
The old physician set down his medical bag and approached, gesturing for Kazuki to sit. Reluctantly, Kazuki complied, settling back onto the futon.
Murata's examination was thorough, checking his pulse, examining tongue, listening to breathing, pressing fingers against various points on Kazuki's body. His methods were primitive by modern standards, but there was a certain logic to them, a framework of understanding built over centuries of observation.
"Your pulse is still too weak," Murata finally pronounced. "Your lungs still compromised. The fever broke, yes, but the underlying weakness remains. You are not recovered, young master. You are merely... stable."
"Then tell me how to become more than stable," Kazuki said. "Tell me what this body needs. What I should eat. What exercises I can handle."
Murata paused, surprised. In all the years he'd tended to this sickly young lord, Kazuki had never dared ask such questions. Had always been passive, accepting his weakness as inevitable.
"You've never asked before," Murata said carefully.
"I've never had any reason to live before," Kazuki replied. "Now I do. So tell me, physician. What can this body handle?"
Murata studied him for a long moment, those old eyes seeing more than Kazuki would have liked.
"Your lungs are damaged from repeated respiratory infections. Perhaps sixty percent capacity compared to a healthy man. Any heavy exertion will leave you breathless, possibly trigger another illness."
Sixty percent. I was close.
"Your muscles are severely atrophied from months of bed rest. Any sudden movement could tear them. Your bones are thin, a bad fall could easily break them. Your heart is weak, though functional. Your digestion is poor."
The list went on. It was, frankly, depressing.
"In short," Murata concluded, "you are held together by will and divine favor alone. Push too hard, and you will break fast."
"And if I push carefully?" Kazuki asked. "Gradually? If I eat properly, exercise slowly, build strength over time?"
Murata's expression shifted to something like... respect?
"Then you might, in time, become healthy. Not a warrior like your brother. But still healthy nonetheless. Probably able to live a normal life rather than dying young."
I'll take it, Kazuki thought. It's a start.
"What should I eat?"
"Broths and soups for now. Easy to digest. Rice porridge. Steamed fish. Avoid raw or cold foods, they tax your digestion to much. Warm tea. And rest. Lots of rest."
"And exercise?"
"Gentle stretching only. No exertion. Absolutely no combat training. Your body cannot handle it."
Kazuki nodded, committing it to memory. He'd follow about half of this advice. The diet part was sound, modern nutrition science agreed on easily digestible proteins and carbohydrates for recovery. But the rest?
Sorry, Murata-sensei. I've got modern physical therapy knowledge. I know what this body can actually handle.
"I'll follow your guidance," Kazuki said, which wasn't technically a lie. He'd follow the parts that made sense to him.
Murata seemed satisfied. He prepared a packet of herbs, explaining how to brew them into tea, then bowed and prepared to leave.
"Murata-sensei," Kazuki called as the old man reached the door. "Thank you. For keeping me alive this long."
The physician turned back, genuine warmth in his expression. "It is my honor to serve, young master. And... I am glad you survived. The castle is brighter with you in it."
The castle doesn't even know I exist, Kazuki thought. But that's going to change very soon.
After Murata left, a servant arrived with a message: his father requested his immediate presence.
Kazuki's stomach tightened. This was it. The first real test for him. He'd have to face his new family, convince them he wasn't just having a temporary burst of energy before finally dying.
He dressed carefully in a simple but proper kimono—dark blue with subtle grey patterns, appropriate for his station without being too ostentatious. His hands fumbled clumsily with the ties. Kazuki's body knew the motions, but they still felt foreign to Takeshi's consciousness.
The walk to his father's study took him through the castle's interior corridors. Karatsu Castle was modest by daimyo standards at that time—three stories, wooden construction with stone foundation, surrounded by a moat and earthwork walls. Not the towering fortresses of more powerful clans, but respectable.
Servants stopped and stared as he passed. The whispers started immediately.
"Is that the young master?"
"Walking? On his own?"
"I heard he was dying just yesterday..."
"Divine intervention, they say."
"His eyes look different."
Kazuki kept his gaze forward, but his mind catalogued everything with Takeshi's engineering precision. The castle's layout. Defensive weaknesses. Fire hazards. Structural integrity. Water sources. Escape routes.
Old habit from strategy games, he realized. Except this is real now. If this castle were attacked, these weaknesses would get many people killed.
The corridors were narrow, the ceilings low. Good for defense, made it harder for attackers to maneuver, but poor for modern comfort as well. Thin paper screens divided rooms rather than solid walls. Real privacy was just an illusion here.
He reached his father's study and paused outside the door, steadying himself for the inevitable. He heard voices inside, his Father's deep rumble, and another voice, younger. Nobuyuki.
Of course he's here. The heir, observing how the family handles the problematic third son.
Kazuki knocked.
"Enter."
He slid the door open and stepped inside.
The study was austere, befitting a warrior lord. Weapons displayed on one wall, a katana and wakizashi pair, a yari spear, a naginata. Scrolls lined shelves, mostly administrative records and military treatises. A low desk dominated the center of the room, behind which sat Matsudaira Hirotada.
Fifty-two years old. A scarred warrior with graying hair pulled back in a simple topknot. He had hard eyes that had seen too much war. His face weathered by decades of stress and combat. He wore a simple dark kimono, but his presence dominated the room.
This was a man who'd fought his way to power and held it through pure strength and will.
Standing to the side was Odai no Kata, Kazuki's mother. Forty-five, still beautiful despite the years. A gentle face, but sharp eyes. She wore the formal garb of a Shinto priestess, white and red, her status in the local shrine reflected in her attire.
And near the weapons, arms crossed, stood Matsudaira Nobuyuki.
Twenty-six. Everything Kazuki wasn't. Tall, muscular, very handsome in a rough, martial way. He had short hair, practical for wearing a helmet. He'd probably just come from training, as he still wore informal armor, a simple breastplate over martial clothing. Sweat still glistened on his neck.
His eyes locked onto Kazuki with barely concealed hostility.
There it is, Kazuki thought. The brother who sees me as a threat to his inheritance.
"Kazuki," Hirotada said, his voice carefully neutral. "Sit."
Kazuki bowed respectfully to his father, then moved to kneel in proper seiza position before the desk. His legs protested immediately, seiza was torture for his weakened muscles, but he forced his expression to remain neutral.
I've sat through eight-hour office meetings. I can handle this.
Hirotada studied him in silence for a long moment. His mother watched him with an expression that was hard to read. Nobuyuki's jaw clenched.
"The physician says you should not have survived," Hirotada finally said. "Yet here you are."
"I am grateful to the gods and to Murata-sensei's care, Father."
"You somehow look different." Hirotada's eyes narrowed. "Your overall bearing. Your eyes. Even the way you sit. You've never held proper seiza for more than a few minutes without fidgeting."
Damn. Too much too fast.
"The fever changed me, Father. When death stares you in the face, it... clarifies some things. I've wasted twenty years being weak. I don't intend to waste whatever precious time the gods have granted me any longer."
Nobuyuki scoffed. "Bold words from someone who can barely stand without help."
Kazuki turned his gaze to his brother, meeting his hostile eyes directly. In his previous life, Takeshi had always avoided confrontation, always looked away first. Not anymore.
"You're right, brother. I am currently weak. For now. But weakness can always be corrected. I intend to grow stronger over time. Strong enough to be useful to this family."
The room went very quiet.
Nobuyuki's expression darkened. "You think a few days of sudden vigor changes anything? You've been useless your entire life, little brother. A drain on resources. A source of shame."
"Nobuyuki," Odai said softly, but her son ignored her.
"Father wastes rice feeding you when you contribute nothing. The servants whisper that you're cursed, that keeping you alive brings misfortune to the whole domain. And now, suddenly, you want to be 'useful'?"
Kazuki kept his voice level. "I understand your doubts, brother. I've earned them. But yes. I intend to change."
"Enough," Hirotada said, the single word cutting through the tension like a blade. "Nobuyuki, you forget yourself. Kazuki is still your brother and my son. You will show him proper respect."
Nobuyuki's jaw tightened, but he bowed his head in the end. "Forgive me, Father. I spoke out of turn."
Hirotada's attention returned to Kazuki. "Actions speak louder than words, my son. If you truly wish to be useful, you will need to prove it. Not with words, but with deeds."
"Then give me the opportunity to prove myself, Father."
"What do you propose?"
Kazuki had thought about this carefully. He couldn't reveal too much, couldn't seem too knowledgeable too quickly. But he needed a foothold, a way to start implementing much needed changes.
"Allow me to study our domain's administration," he said. "Our finances. Our defenses. Our resources. Let me learn how to serve our family properly. If I understand our situation, perhaps I can find ways to help improve it."
Nobuyuki laughed harshly. "Father, this is absurd. He's been bedridden for weeks and before that spent his days reading poetry and philosophy. What could he possibly..."
"I've been reading, yes," Kazuki interrupted, his eyes still locked at his father. "History. Strategy. Administration. While Nobuyuki-san trained with the sword, I trained my mind. Perhaps it's time that knowledge became useful."
Hirotada leaned back slightly, giving it some thought. His scarred hands folded together on the desk.
"What do you know of administration?"
"Less than I should," Kazuki admitted. "Which is why I need to earnestly study it. But I know that knowledge is power, Father. Sun Tzu wrote that to know your enemy and know yourself is to win a hundred battles. I wish to know our domain, our strengths, our weaknesses, our resources. Only then can I hope to contribute."
Quoting Sun Tzu. Safe. He's ancient even in this time period.
A flicker of something crossed Hirotada's face. Interest? Maybe surprise?
"You've read Sun Tzu?"
"I've read what I could find, Father. The Art of War. The Five Rings. Historical accounts of great campaigns. I may not be a warrior, but I can learn how warriors think."
Nobuyuki looked like he wanted to object again, but Hirotada raised a hand, silencing him instantly.
"Very well," the daimyo said. "I will have our steward grant you access to our administrative records. You may study our finances, our resources, our obligations. But Kazuki...", his voice hardened, "if this is merely another flight of fancy, I will not indulge it. If you waste the steward's time, if you prove utterly incapable, you will return to your quarters immediately and stop disturbing the household. Am I clear?"
"Perfectly clear, Father. I will not fail you."
"We shall see. You are dismissed."
Kazuki bowed deeply, then carefully stood up. His legs had already gone numb from seiza. He forced himself to walk normally, not limp, as he left the study.
The door slid shut behind him.
Only then did he allow himself to lean against the wall, breathing hard. His legs trembled. Sweat beaded on his forehead.
That went better than originally expected. I have proper access now. That's step one.
"Walk with me, my son."
He turned. Odai had followed him out, closing the study door behind her.
"Mother..."
"In the garden," she said softly. "Where we can speak privately."
They walked in silence through the castle corridors and out into the inner garden, a small space with carefully tended plants, a koi pond, and a small shrine to the local kami. Odai's domain, where she performed her duties as priestess.
When they were alone, surrounded by stone lanterns and maple trees, she finally turned to face him.
"The fever that nearly took you," she said quietly. "What did you see? In the darkness?"
Kazuki hesitated. Odai no Kata was a Shinto priestess. She wholeheartedly believed in the divine, in spirits and kami and the unseen world. How much could he actually tell her?
"I saw a choice, Mother. Live or die. Fight or surrender. I chose to fight."
"And something spoke to you, didn't it?"
His breath caught. "How did you..."
"I am a priestess, Kazuki. I serve the divine. I can feel their faint presence." Her eyes searched his face. "Your spirit has changed. Not corrupted, nor possessed, but... somehow transformed. As if two souls now share one body."
Too close. Way too close for his tastes.
"The kami spoke to you," she continued. "Told you something. Gave you something. I can feel it like i can feel the heat from a fire."
Kazuki met her eyes. "Can you keep a secret, Mother? Even from Father?"
"If the gods command it, yes."
He took a breath. "Something did speak to me. In the void between life and death. It said..." he chose his words carefully, "that I had been given a second chance. That I possessed knowledge but no stage to use it. That I would be granted another life, but only if I changed the world with what I know."
Odai's expression didn't change, but her hands clenched slightly in the folds of her robes.
"What kind of knowledge?"
"How to make things. Better tools. Better weapons. How to organize people, resources. How to..." he struggled for words that wouldn't sound too insane, "build a better future."
Enjoying the story? Show your support by reading it on the official site.
"The kami have chosen you," she whispered. "For what purpose, I don't fully understand yet. But I feel their will in this. You are meant for something far greater than this small domain."
"Will you support me, Mother? Even if what I do seems... unusual? Even if I make changes that will confuse or frighten people?"
She reached out and took his hands. Her grip was surprisingly strong.
"I am a priestess, Kazuki. I serve the divine will above all else. If the gods have touched you, given you purpose, then I will support you. But..." her expression hardened "be very, very careful. Your brother..."
"I know."
"No, you don't. Not fully." She glanced back toward the castle. "Nobuyuki has always been your father's favorite. The strong son. The warrior. The heir. Your survival threatens that. Before, you were no threat, too weak to actually matter. But now? If you truly become capable, if you prove yourself useful..."
"He'll see me as competition to his position."
"He already does. I saw it in his eyes during the meeting. Kazuki, your brother is not cruel by nature, but he is too ambitious. And ambitious men do terrible things to protect what they believe is rightfully theirs."
"I'll be careful, Mother. I promise."
She squeezed his hands once more, then released them. "Good. Now go, before people wonder why we're speaking privately. And Kazuki?"
"Yes?"
"Eat something. You're far too thin. The gods may have given you purpose, but they didn't give you a healthy body. That, you must build yourself."
That evening, as the sunset painted the sky orange and red, Kazuki made his way to the castle's administrative office.
The steward was an elderly man named Tanaka, who seemed perpetually exhausted by the burden of managing a bankrupt domain. He'd been instructed to grant Kazuki access to the records, though his skeptical expression suggested he expected this to be a waste of his precious time.
"Here are the financial ledgers, young master," Tanaka said, gesturing to a stack of bound documents. "Tax records, expenditure logs, debt obligations. Everything you requested."
"Thank you, Tanaka-san. I'll review them tonight."
"Tonight?" The steward blinked. "Young master, these records span years. It would take weeks to..."
"Then I'd better start now, don't I?"
Tanaka bowed and left, shaking his head.
Kazuki settled down with the documents and lit several candles. The office was quiet, isolated, perfect for concentration.
And then he started reading.
The financial records were... depressing.
Takeshi's modern education and engineering background meant he could parse numbers and systems with ease. What he saw was a domain circling the drain.
Annual Income:
- Rice production: 30,000 koku (the domain's official rating—roughly 4,500 metric tons of rice, enough to feed thirty thousand people for a year)
- Fishing industry: approximately 500 ryo (roughly equivalent to 500 koku in value)
- Small-scale mining: 200 ryo
- Trade and tariffs: 300 ryo
- Total: roughly 31,000 koku equivalent
Annual Expenditures:
- Samurai stipends: 15,000 koku (legally required, couldn't be reduced—each samurai received between 50-200 koku depending on rank)
- Domain administration and maintenance: 3,000 koku
- Castle upkeep and garrison: 2,000 koku
- Tribute to Ryuzoji clan: 5,000 koku (nearly 750 metric tons of rice annually, pure extortion)
- Debt interest and repayment: 4,000 koku
- Total: 29,000 koku
On paper, they were barely solvent. In reality, it was worse. The "surplus" of 2,000 koku, about 300 metric tons of rice, or enough to feed two thousand people, had to cover emergency expenses, failed harvests, necessary investments, everything unpredictable.
One bad year and the domain would collapse.
And that debt...
He found the original loan documents. Five years ago, Hirotada had borrowed 50,000 ryo from Osaka merchants to finance a defensive war against Matsuura pirates. In practical terms, that was enough gold to purchase 50,000 koku of rice, 7,500 metric tons, enough to feed the entire domain for nearly two years. The war had been inconclusive, the pirates driven off but ultimately not defeated. The borrowed funds had paid for ronin mercenaries, weapons, supplies.
The interest rate was fifteen percent annually. Compounding.
Usury, Takeshi's mind recognized immediately. Legal in this period, but absolutely predatory.
At the current repayment rate of 4,000 koku annually, about 600 metric tons of rice per year, it would take over twenty-five years to clear the debt. And that assumed no new emergencies, no new conflicts, perfect conditions.
The domain was drowning slowly, systematically.
He heard footsteps approaching and looked up. A woman entered the office, carrying more ledgers. She stopped in her track when she saw Kazuki.
"Oh! Young master, I didn't expect anyone to be here at this hour."
Soga Rin. The name surfaced from Kazuki's memories. Twenty-nine years old, widow of a merchant who'd died in the war with the Matsuura. She'd been educated, unusual for a woman at this time period, and had proved herself competent enough that Hirotada had hired her to help manage the domain's accounts.
She wore simple but quality clothing, her dark hair tied back practically. Intelligent eyes that assessed him quickly.
"I couldn't sleep," Kazuki said. "Father gave me permission to review our records. I hope I'm not disturbing your work."
"Not at all, young master." She set down the ledgers. "I was just bringing updated tax collection reports. May I ask... what specifically are you reviewing?"
"Everything. But right now, our debt situation."
Rin's expression became carefully neutral. "It's... concerning."
"That's diplomatic phrasing. It's catastrophic."
She blinked, surprised by his bluntness.
"How did we accumulate this debt?" Kazuki asked. "I know the basics, the war five years ago, but the details?"
Rin hesitated, then seemed to decide that honesty was appropriate.
"The Matsuura pirates had been raiding our coastal villages for years. Small attacks, but persistent. Your father finally decided to deal a decisive blow to them. He hired ronin, masterless samurai, to bolster our forces. Purchased additional weapons and armor. Provisioned an army for a three-month campaign."
"And the results?"
"We drove them back to their islands. But we couldn't maintain a prolonged siege. The ronin demanded their pay. We didn't have enough in the treasury. So your father borrowed from merchants in Osaka and Sakai."
"At fifteen percent interest."
"The merchants knew we were desperate. They charged what the market would bear."
Kazuki leaned back, thinking. This was actually worse than typical medieval debt because these weren't feudal obligations that could be negotiated or forgiven. These were commercial debts to merchants who had legal recourse.
"And the tribute to Ryuzoji?" he asked.
Rin's expression darkened. "Protection money, essentially. Ryuzoji Takanobu controls most of Hizen Province. We're a small domain on his periphery. He could crush us easily if he wished. So we pay tribute in exchange for... not being crushed."
"Extortion."
"Politics, young master."
"Same thing in my eyes." Kazuki studied the numbers again. "The fishing industry brings in 500 ryo annually(equivalent to 500 koku of rice, enough to feed five hundred people for a year), That seems low for a coastal domain."
"It is. But our fishermen have poor equipment. Old boats. They can't venture far from shore. And the Matsuura pirates still occasionally raid fishing vessels."
"What about the mining operations?"
"Small scale. Some iron ore in the mountains. Coal deposits north of town. But mining is considered low-class work. The output is minimal."
"Coal," Kazuki said thoughtfully. "How much coal?"
"I... don't know exactly, young master. It's not considered valuable. Peasants use it for heating and cooking, but that's about all."
Oh, Rin, Kazuki thought. You have no idea.
In his previous life, Takeshi had studied the industrial revolution extensively. Coal wasn't just fuel. It was the foundation of everything, power for forges, fuel for advanced metallurgy, eventually steam power.
These people were sitting on the energy source that would transform their world, and they saw it as peasant fuel.
"What about our military strength?" Kazuki asked.
Rin pulled out another ledger. "We maintain approximately five hundred samurai, as required by our domain's rating, a ratio of about one samurai per sixty koku of production. About fifteen hundred ashigaru can be conscripted in times of war." We have twelve ships, but they're converted fishing vessels, not proper warships."
"Weapons?"
"Primarily yari, spears. Some bows. A small number of swords for the samurai class."
"Hmm, i see"
No firearms yet, apparently. Because swords are so much better against bullets, Kazuki thought but didn't say.
In the original timeline, firearms had been introduced to Japan this very year, 1543, when Portuguese merchants landed at Tanegashima. Within decades, Japanese craftsmen had not only replicated them but improved upon them, producing firearms at a scale that rivaled Europe.
But that knowledge was confined to a few domains initially. If Karatsu could get ahead of that curve...
"Rin-san," Kazuki said carefully. "The coal deposits you mentioned. Where exactly are they located?"
"North of the castle town, about five ri(roughly twenty kilometers). In the hills."
"And they're undeveloped?"
"Mostly. Some peasants dig there for personal use, but there's no organized mining."
"What if we changed that? What if we began systematic coal mining and sale?"
Rin looked puzzled. "Young master, who would we sell to? Coal is cheap fuel. There's no profit in it."
"Not yet," Kazuki said with a slight smile. "But there will be very soon. Trust me on this."
She studied him with those intelligent eyes. "You're very different from before your illness, young master. You speak with... certainty. As if you know things others don't."
Careful.
"The fever gave me time to think," Kazuki said. "To see our situation clearly. We're drowning in debt while sitting on resources we currently don't use. That has to change."
"And you think you can change it?"
"I think I have to try. Because if we continue as we are, this domain will collapse within a decade."
Rin was quiet for a moment. Then: "What do you need from me?"
"Information. Help understanding the systems we have. And..." he hesitated. "Your discretion. Some of the ideas I have may seem strange. Unconventional. I need people who can think beyond tradition."
She smiled slightly. "Young master, I'm a woman managing accounts in a man's world. I've already stepped beyond tradition. If you're serious about saving this domain, you'll have my support."
Another ally. Slowly, carefully, he was building a foundation.
They worked together late into the night, Rin explaining the intricacies of the domain's systems while Kazuki took mental notes, already formulating plans.
By the time he finally returned to his room, utterly exhausted, the moon was already high on the firmament.
But he didn't sleep immediately. Instead, he found ink and paper, valuable commodities, but Kazuki as a lord's son had access, and began writing.
Not in Japanese. In English. A secret code that no one in this world could read.
DAY 2 - ASSESSMENT
ASSETS:
- Modern knowledge (engineering, chemistry, military history, economics)
- Weak but functional body (can be improved over 6-12 months)
- Official access to domain records and resources
- Forming alliances: Mother (divine support), Rin (administrative), need more
LIABILITIES:
- Severe physical weakness (training required, high injury risk)
- Nobuyuki actively hostile (assassination risk - must prepare)
- Domain bankrupt (50,000 ryo debt, 15% interest, 25+ years to repay)
- Military inadequate (no firearms, poor equipment, low morale)
- Surrounded by enemies (Ryuzoji extortion, Matsuura pirates, Arima to south)
- Divine mandate (change world or suffer eternally - time pressure unknown)
IMMEDIATE PRIORITIES:
- Physical conditioning (survival - need strength to act)
- Build loyal faction (cannot act alone, need trusted people)
- Identify quick economic wins (need credibility + resources)
- Begin technology introduction (carefully, gradually)
- Counter brother's threat (defensive measures)
MEDIUM-TERM GOALS (6 months - 2 years):
- Develop coal mining operation (revenue + industrial fuel)
- Improve steel production (weapons + tools + trade goods)
- Train basic military force (protection)
- Reduce debt burden (negotiate or pay down)
- Establish independence from Ryuzoji (stop tribute)
LONG-TERM GOALS (2-10 years):
- Industrialize domain (manufacturing base)
- Create modern military (firearms, discipline, tactics)
- Expand territory (conquer or alliance)
- Eliminate all threats (Ryuzoji, Matsuura, Arima)
- Position for national power (eventually unify Kyushu, then Japan)
FIRST MAJOR PROJECT: Coal mining + improved steel production = money + better weapons = survival
KEY INSIGHT: In the original timeline, Nobunaga doesn't begin his conquests for another 15 years. Takeda and Uesugi are locked in their rivalry. Mori controls the west but isn't expansionist yet. Kyushu is fragmented.
There's a window. If I can build power here, in Kyushu, isolated from the main power struggles on Honshu, I can create an industrial base early on before anyone understands what's happening.
By the time the great clans notice Karatsu, we'll be too strong to dismiss.
The game begins.
Kazuki set down the brush and stared at what he'd written. In English, it looked like gibberish to anyone else. His private thoughts, his plans, protected by the accident of his reincarnation.
He was exhausted. His body ached. But his mind was clearer than it had been in all those years.
In my last life, I had all the time in the world and did nothing with it. In this life, I have no time at all. But I finally have some purpose.
He extinguished the candle and lay down, staring at the ceiling in the darkness.
Tomorrow, the real work would begin.
Dawn came too quickly for his tastes.
Kazuki woke before sunrise, an old habit from his previous life as an engineer, when he'd drag himself out of bed at 6:30 AM for the morning commute. His body protested immediately, every muscle sore from yesterday's minimal activity.
Good, he thought. Pain means I'm pushing past my limits. Limits can always be expanded.
He dressed in the simplest clothing he managed to find, a plain dark kimono meant for manual work, not the formal wear expected of a lord's son. If anyone asked, he'd claim he was trying not to dirty his good clothes.
The castle was still mostly asleep. A few servants moved quietly through corridors, preparing for the day. They bowed deeply when they saw Kazuki, clearly shocked to see him up so early.
He made his way to the inner courtyard, a training area with packed earth, surrounded by covered walkways. This was where samurai practiced their martial arts. At this hour, it should be empty.
It was.
Kazuki stood in the center of the courtyard, feeling the cool morning air on his skin. The sky was just beginning to lighten, stars still fading.
Alright, body. Let's see what you can actually do.
He started with stretching. Not the token stretches he'd done in gym class or the occasional half-hearted attempts in his previous life. Real, systematic stretching based on modern physical therapy principles.
Hamstrings. Quadriceps. Hip flexors. Shoulders. Back. Neck.
Everything was tight, inflexible. He could barely touch his knees, let alone his toes. His shoulders screamed when he tried to extend his arms fully overhead.
Months of bed rest. Years of sedentary lifestyle before that. This body is a disaster.
But it was his disaster now. And he aimed at fixing it.
After stretching, he moved to bodyweight exercises. But modified, adapted for his current pathetic state.
Push-ups? Impossible. His arms couldn't support his weight.
Solution: wall push-ups. He found a support pillar and placed his hands against it, stepping back to create an angle. Then he lowered himself toward the wall and pushed back.
Three repetitions before his arms gave out.
Pathetic. But it's a baseline. Tomorrow I'll try to do four.
Squats? His legs trembled after five.
Planks? He lasted ten seconds before collapsing.
But he kept going. Rest, try again. Rest, try again.
By the time the sun fully rose, he was drenched in sweat, breathing hard, every muscle shaking.
And he felt alive.
"Young master?"
Kazuki turned. A man stood at the edge of the courtyard, mid-twenties, muscular build, wearing the simple armor of an ashigaru captain. Honda Tadakatsu. The name surfaced from Kazuki's memories.
Honda had been born to a low-ranking samurai family, but had proven himself competent enough to rise to the position of captain of the ashigaru, foot soldiers. He was one of the few actually skilled warriors in Karatsu's modest military.
"Honda-san," Kazuki managed between breaths.
Honda approached, his expression a mixture of concern and confusion. "Young master, what are you doing? You're still recovering. You should not be exerting yourself like this."
"I'm training."
"Training?" Honda looked at the sweat-soaked Kazuki. "Young master, with respect, what you were doing... those movements are strange. I've never seen exercises like that."
"They're from a book I read," Kazuki said, the lie coming easily. "Foreign techniques. From China."
China works as a catch-all explanation. Far enough away that details can't be easily verified.
Honda studied him carefully. "Do they work?"
"I don't know yet. But I need to get stronger, Honda-san. This body is too weak. I've been weak my entire life. That has to change."
"Why the sudden urgency, young master?" Honda's tone was respectful but probing. "You've never shown any interest in physical training before."
Because the old Kazuki accepted his weakness as fate. I don't.
"Because I nearly died," Kazuki said simply. "And I realized that if I stay weak all my life, I'll die young. Uselessly. I don't want that."
Honda's expression softened. There was something like respect in his eyes now.
"If you're serious about training, young master, you need proper instruction. What you were doing... your form is poor. You'll injure yourself."
"Will you teach me?"
The question hung in the air. Honda hesitated.
"Young master, I'm just an ashigaru captain. Your brother is the warrior of the family. Surely he..."
"My brother won't help me," Kazuki said flatly. "And I'm not asking for samurai sword training. I'm asking you to help me build strength. To become healthy. Can you do that?"
Honda looked into Kazuki's eyes. Whatever he saw there seemed to harden his resolve.
"If you're truly committed, young master, then yes. I will help you. But it will be hard. There will be lots of pain. And progress will be slow."
"I understand."
"And you cannot tell anyone I'm training a lord's son. It would be... inappropriate."
"Our secret, then."
Honda bowed. "Meet me here tomorrow, same time. We'll begin properly."
The rest of the day passed in a blur of activity.
Mid-morning, Kazuki ventured into the castle town for the first time in months. Kiku insisted on accompanying him, worried he'd collapse in the street.
The town was larger than Kazuki's memories suggested, around eight thousand people, maybe more. The entire domain, including surrounding villages, had a population of roughly thirty thousand souls, which made sense for a 30,000 koku domain, where each koku theoretically fed one person annually. By modern standards, it was a village. By Sengoku-period standards, it was respectable for a small domain.
But Takeshi's modern eyes saw poverty everywhere.
Most buildings were wooden, simple construction. No sanitation system, waste was simply dumped into designated areas or the ocean. The streets were unpaved dirt that would turn to mud fast when raining. People were thin, signs of malnutrition were common.
The market was active but small. Fish, rice, vegetables, some cloth. No luxury goods. No books. No metal goods beyond simple tools.
This is what peasant life looks like without modern infrastructure, Takeshi's mind catalogued clinically. Disease. Malnutrition. Early death. They probably think this is normal.
But he couldn't fix everything at once. First things first: find the smith.
The forge was near the edge of town, where the smoke wouldn't bother as many people. The sound of hammer on anvil rang out clearly.
Kazuki approached and stopped at the entrance. The forge was hot, the air shimmering. Inside, a figure worked, hammering a piece of glowing steel with practiced precision.
A woman.
Muramasa Sengo. Fifty-eight years old. Widow of the previous smith. When her husband died ten years ago, she'd taken over the forge rather than remarry. Scandalous. Improper. But she'd proven herself skilled enough that people tolerated it.
She wore practical clothing, a heavy apron over a simple robe, her gray-streaked hair tied back. Her arms were muscular, her hands scarred from years of hard work.
She didn't notice Kazuki at first, focused entirely on her current work.
He waited silently, not wanting to disturb the delicate process of shaping hot steel.
Finally, she plunged the piece into water. Steam hissed. Only then did she look up.
Her eyes widened slightly when she saw him.
"We're closed," she said gruffly. "Come back tomorrow."
"I'm not here to buy anything," Kazuki said. "I'm here to talk."
She squinted at him, then recognized his fine clothing despite its simplicity.
"Oh. Young master." Her tone became more respectful, but not servile. She bowed, but minimally. "Forgive me, I didn't recognize you. I don't get many visitors from the castle often."
Because you're a woman doing a man's job, Kazuki thought. And the samurai class looks down on you for it.
"Please, don't apologize. I should have announced myself. May I come in?"
Muramasa hesitated, then nodded. "If you wish, young master. Though I warn you, it's hot and dirty work. Not suitable for nobility."
Kazuki stepped into the forge. The heat was intense, almost overwhelming. The smell of coal smoke and hot metal filled his lungs.
And it was strangely beautiful.
Takeshi had worked with metal in his engineering studies. Had understood the theory of metallurgy, the crystal structures, the temperature curves, the chemistry. But he'd never actually forged anything himself.
Seeing it now, with Takeshi's knowledge and Kazuki's eyes, he understood the craft on a deeper level.
"Your work is impressive," he said, examining the blades displayed on the wall. Katanas, wakizashis, tantos. Some were utilitarian, others were real works of art.
Muramasa's expression softened slightly. "You have an eye for quality. Most young lords wouldn't be able to differantiate good steel from pig iron."
"I've studied metallurgy," Kazuki said. "Well to be honest, I read about it. The theory fascinates me."
"Theory is one thing. Practice is another."
"Which is why I'm here. I want to learn. Will you teach me about steel? About forging?"
Muramasa actually laughed. "Teach a lord's son to be a blacksmith? Young master, are you mocking me?"
"I'm completely serious."
She studied him carefully. "Why would you want to learn such things? It's beneath your station."
"Because knowledge is never beneath anyone's station," Kazuki replied. "And because I have new ideas. About steel. About how it can be produced better, stronger, in larger quantities. But I need to understand the proper craft first."
Muramasa's eyes narrowed. "Better steel? Young master, I've been forging for forty years. My late husband taught me everything..."
"And it's impressive work," Kazuki interrupted gently. "Truly. But what if I told you there are techniques that could make steel even stronger? Easier to work with? Produced more efficiently?"
"I'd say you're either a dreamer. Or a complete fool."
"Perhaps both. But I'm also determined. Will you at least listen to my ideas?"
Muramasa set down her hammer. "You're different from other nobles, young master. Most wouldn't even acknowledge my existence, let alone come to my forge."
"I'm not most nobles. So. Will you listen?"
She was quiet for a moment, then gestured to a rough wooden bench. "Sit. Let's talk. But I make no promises."
They talked for over an hour.
Kazuki was careful. He couldn't reveal too much modern knowledge too quickly. But he sketched out basic concepts, better furnace designs for temperature control. The importance of removing impurities from iron. The possibility of standardizing production.
He framed it all as "theories" he'd read in "ancient Chinese texts."
Muramasa listened, initially skeptical. But gradually, her expression changed. Some of what Kazuki described aligned with problems she'd encountered herself. Some of it sparked recognition, things she'd wondered about but never had the language to articulate.
"These ideas," she finally said. "If they work, and I'm not saying they will, they would change everything. Stronger steel, easier to produce? That would..."
"Change warfare," Kazuki finished. "Change construction. Change everything metal may touch."
"It would make a smith who mastered such techniques incredibly wealthy."
"It would make a domain that mastered such techniques very powerful."
Muramasa met his eyes. "You're not just a curious young lord, are you? You have actual plans."
"This domain is slowly dying, Muramasa-san. We're drowning in debt, surrounded by enemies on all sides, using old and outdated methods. We need every advantage we can get a hold on. And you..." he looked around the forge, "you're brilliant but limited by tradition and resources. Work with me. Let me provide resources and protection. You provide expertise. Together we can create something this world has never seen before."
"You're asking me to gamble my reputation on the dreams of a sickly lord's son."
"I'm asking you to gamble on the future. On the possibility that maybe, just maybe, there's a better way."
Muramasa was quiet for a long moment. Then she extended her scarred, calloused hand.
"I'll try your experiments, young master. Not because I fully believe you. But because you're the first person in ten years to treat me like a person rather than a scandal. If nothing else, I owe you that much respect."
Kazuki shook her hand. Her grip was like iron.
Another ally. Another piece in place.
That evening, exhausted beyond measure, Kazuki returned to his room.
His body ached everywhere. His mind buzzed with plans and calculations. He'd accomplished more in two days than Kazuki had in twenty years.
But the hardest part was still to come.
As he prepared for bed, there was a knock at his door.
"Enter."
The door slid open. Nobuyuki stood there, silhouetted against the corridor light.
"Little brother. Walk with me."
It wasn't a request.
They walked through the castle in silence, Nobuyuki leading. They ended up in an empty corridor, far from any occupied rooms.
Then Nobuyuki moved.
Fast. Brutally fast.
His hand shot out, grabbing Kazuki's collar, and slammed him against the wall. The impact drove the air out of Kazuki's lungs.
"Listen very carefully, little brother," Nobuyuki hissed, his face mere inches from Kazuki's. "I don't know what game you're playing, but it ends now."
Kazuki tried to speak but couldn't breathe. Nobuyuki's grip was crushing.
"You've been useless your entire pathetic life. A burden. A source of shame. And suddenly, after one fever, you want to 'study administration'? You want to be 'useful'?"
He slammed Kazuki against the wall again.
"I see what you're doing. You think that if you make yourself valuable, Father will reconsider the succession. You think you can steal my birthright."
"I... don't..." Kazuki managed to gasp.
"Shut up." Nobuyuki's eyes were cold, calculating. "You will stay in your place. Weak. Sick. Irrelevant. You will not interfere with my inheritance. You will not make yourself useful. You will remain the same useless cripple you've always been."
He released Kazuki suddenly. Kazuki collapsed to his knees, gasping.
"Because if you don't," Nobuyuki continued softly, "if you try to rise above your station, I will make sure you have another 'unfortunate illness.' One you won't survive this time. Do we understand each other?"
Kazuki looked up, meeting his brother's eyes despite the fear coursing through him.
In his previous life, Takeshi would have agreed immediately. Would have backed down, avoided conflict at all costs.
Not anymore.
"I understand," Kazuki said, his voice hoarse. "You're threatened by me."
Nobuyuki's expression darkened. "What?"
"You're the strong son. The warrior. The heir. And you're so insecure that a sickly younger brother trying to be useful terrifies you."
"You dare..."
"I dare," Kazuki interrupted, forcing himself to stand despite his trembling legs. "Because I have nothing else to lose, brother. I nearly died. The old Kazuki who feared you? He's dead. What stands before you now has already faced death and chosen to fight instead."
They stared at each other.
"You should be very careful, little brother," Nobuyuki said quietly. "Accidents happen. Especially to people who forget their place."
"And you should remember," Kazuki replied, "that the weak can become strong too. The useful can become indispensable. And the ignorant who underestimate the desperate often pay dearly for it."
Nobuyuki's hand moved to his katana.
For a heartbeat, Kazuki thought he might actually draw it.
Then footsteps echoed down the corridor. A servant, approaching with a lamp.
Nobuyuki released his sword. "This conversation isn't over yet."
"I agree. But next time we have it, I won't be so weak."
Nobuyuki walked away without another word.
Kazuki remained leaning against the wall, his whole body shaking. Not just from fear. From rage. From determination.
You want to kill me, brother? Get in line. The divine voice threatening eternal suffering has priority.
He made his way back to his room, locked the door, and sat down with ink and paper.
Added to his notes in English:
NOBUYUKI - IMMEDIATE THREAT
- Wants me dead
- Has means (poison, "accident")
- Has motive (sees me as succession threat)
- Will act if I become too useful/visible
COUNTERMEASURES:
- Food taster (traditional, won't seem suspicious)
- Lock door at night (basic security)
- Build loyal guards (Honda? Others?)
- Make myself indispensable to Father (if I'm valuable, my death becomes investigated)
- Evidence cache (if I die, ensure Nobuyuki is implicated)
- Ultimately: Destroy him before he destroys me
But carefully. I can't seem like the aggressor. I must make him destroy himself.
He stared at what he'd written.
This is my life now. Political intrigue. Assassination plots. Constant danger.
In my last life, the biggest threat was missing a deadline or getting a bad performance review.
In this life, my own brother wants me dead.
Kazuki extinguished the candle and lay in darkness, listening to the night sounds of the castle.
Outside his window, the moon hung over Karatsu. Over the ocean. Over the domain he would transform or die trying.
Tomorrow, Honda would begin his combat training.
Tomorrow, he'd start implementing the first economic reforms.
Tomorrow, the real work of building an empire would begin.
One day at a time, he thought. Get stronger. Build allies. Create value. Survive.
And eventually, I'll be strong enough that threats like Nobuyuki won't matter anymore.
Eventually, I'll matter.
Sleep came slowly, but when it did, he dreamed not of Tokyo and earthquakes, but of forges and steel and armies marching under his banner.