Setting:

A luxurious private palace estate in Kyoto, Japan, is owned by a powerful mafia family controlling business, politics, and underground networks.

ML — Renjiro Kurogane

Age: 29

Occupation: CEO of Kurogane Group & leader of Kurogane Mafia

Personality:

• Cold, calm, elegant

• Extremely dangerous

• Workaholic

• Possessive

• Psycho when angry

• Hates gold diggers

• Believes money can buy everything

• Loyal to friends and family

• Doesn't believe in love

• Rarely talks

Special traits:

• Master strategist

• Terrifying aura

• Can kill without hesitation

Favourite food: none

Hates: spicy food

MC — Haruki Aizawa

Age: 26

Occupation: Doctor

Personality:

• Kind

• Calm

• Elegant

• Friendly

• Gentle

• Very beautiful

• Hard-working

• Loves family and friends

• Loves cats

• Hates people who try to buy him with money

Favourite food: spicy food

MC Best Friend — Daichi Mori

Age: 27

Occupation: Doctor

Personality:

• Protective of Haruki

• Mature

• Calm

• Loyal

• Intelligent

• Friendly but fierce when protecting loved ones

ML Best Friend — Kazuki Takeda

Age: 30

Occupation: Mafia executive & CEO

Personality:

• Cold

• Ruthless

• Loyal to Renjiro

• Workaholic

• Easily angered

• Doesn't trust people

ML Older Brother — Akihiro Kurogane

Age: 34

Occupation: Mafia leader & businessman

Personality:

• Extremely protective

• Cold but loving to family

• Ruthless to enemies

Married to a man.

ML Older Brother's Husband — Sora

Age: 32

Occupation: Househusband

Personality:

• Gentle

• Loving

• Kind

• Family caretaker

• Loves spicy food

ML Younger Brother — Riku Kurogane

Age: 23

Personality:

• Cold

• Short temper

• Mafia member

Secretly dating MC's younger brother.

CHAPTER 1

The Blood King of Kyoto

Night covered Kyoto like a dark silk curtain.

Far away from the peaceful temples and tourists, hidden in the mountains stood a place no ordinary person could enter.

Kurogane Palace.

A massive black estate surrounded by iron gates, guards, and armed men.

Inside the palace was luxury.

Gold lights.

Marble floors.

Traditional Japanese architecture mixed with modern wealth.

But despite its beauty…

Everyone in Japan knew one truth.

The man living here was more terrifying than death.

Inside the palace office.

The room was quiet.

Large windows showed the dark forest outside.

At the center sat a tall man behind a massive desk.

Renjiro Kurogane.

Black suit.

Perfect posture.

Sharp eyes colder than winter.

A glass of whiskey rested beside his hand.

In front of him, a man knelt on the floor trembling.

The man's entire body shook like a leaf.

Renjiro slowly looked down at him.

His voice was calm.

Too calm.

"Explain."

Just one word.

But it made the kneeling man panic.

"S-sir... I didn't betray you! I swear!"

Renjiro leaned back slightly.

His face showed no emotion.

Behind him stood Kazuki Takeda, his best friend.

Kazuki crossed his arms.

His eyes were filled with irritation.

"You stole ten million from the Kurogane accounts," Kazuki said coldly.

The kneeling man shook his head violently.

"No! No! Someone framed me!"

Silence filled the room.

Renjiro slowly picked up a file.

He flipped one page.

Then another.

His eyes moved lazily.

Like a king bored with a criminal.

Finally he spoke again.

"You transferred the money."

The man froze.

"S-sir—"

Renjiro closed the file.

Then he calmly reached into the desk drawer.

And pulled out a gun.

The room instantly became silent.

Even the air felt heavy.

The kneeling man began crying.

"PLEASE! PLEASE FORGIVE ME!"

Renjiro stood up slowly.

His tall figure cast a shadow across the floor.

Step.

Step.

Step.

He walked toward the man.

Each step sounded like a death sentence.

Kazuki watched quietly.

He wasn't surprised.

This was normal.

Renjiro stopped in front of the kneeling man.

He looked down at him like one would look at trash.

"You betrayed my organization."

The man sobbed loudly.

"I'll return the money!"

Renjiro tilted his head slightly.

Cold eyes stared down.

"You think money fixes betrayal?"

Before the man could answer—

BANG

The gunshot echoed through the palace.

The man's body fell to the floor.

Blood slowly spread across the marble.

Renjiro lowered the gun calmly.

His face showed zero emotion.

Kazuki sighed slightly.

"You should let the others handle these things."

Renjiro walked back to his desk.

"No."

He placed the gun down.

"People forget fear."

Kazuki smirked slightly.

That was true.

Renjiro Kurogane ruled the underworld for one reason.

Fear.

Money.

Power.

Violence.

He had everything.

But there was one thing Renjiro never believed in.

Love.

To him, love was just a weakness.

A tool people used to manipulate others.

He had seen too many people approach him for one reason.

Money.

Gold diggers.

Liars.

Renjiro hated them all.

Kazuki sat on the sofa.

"You have a meeting tomorrow."

Renjiro didn't answer.

Instead he opened another file.

Work again.

Always work.

Kazuki shook his head.

"You're going to die in this office one day."

Renjiro calmly replied.

"Better than dying stupid."

Kazuki laughed quietly.

Then a guard knocked on the door.

"Boss."

Renjiro looked up.

"What."

The guard spoke nervously.

"Your younger brother is back."

Kazuki raised an eyebrow.

"Oh? Riku is here already?"

Renjiro leaned back slightly.

His expression still cold.

"Send him in."

The door opened.

A young man entered.

Riku Kurogane.

Same cold eyes.

Same elegant posture.

Same dangerous aura.

But slightly more reckless.

"Brother."

Renjiro looked at him.

"You finished the Osaka job?"

Riku nodded.

"All enemies eliminated."

Kazuki smirked.

"Efficient as always."

Riku walked closer.

But strangely…

He seemed slightly distracted.

Renjiro noticed.

"What."

Riku crossed his arms.

"Nothing."

Renjiro didn't believe him.

But he didn't ask more.

The Kurogane brothers were not emotional people.

They didn't talk about feelings.

Only work.

Only power.

Only survival.

Outside the palace…

Far away in Kyoto city.

Inside a small animal clinic.

A beautiful young man gently held a small injured cat.

His soft voice filled the quiet room.

"It's okay little one."

This man was Haruki Aizawa.

A doctor.

Kind.

Gentle.

Warm.

Completely different from the dark world of the Kurogane family.

Haruki smiled softly as the cat purred.

He had no idea…

That very soon…

His peaceful life would collide with the most dangerous man in Japan.

And when it did—

Blood.

Obsession.

And fate.

Would begin.

Night in Kyoto had grown deeper.

Clouds slowly covered the moon, and the quiet streets of the city became almost empty. The bright tourist areas were still lively, but farther away, the smaller streets were silent except for the sound of wind brushing past buildings.

Inside Aizawa Veterinary Clinic, warm yellow lights filled the small but clean room.

The clinic smelled faintly of disinfectant and fresh tea.

Haruki Aizawa stood beside a metal examination table.

In his arms was a small orange cat wrapped in a soft towel. The cat had a bandage around its tiny paw.

Haruki’s gentle fingers carefully adjusted the bandage while speaking softly.

“Good boy… you're very brave.”

The cat meowed quietly.

Haruki smiled.

His face was calm and beautiful. His dark hair slightly covered his soft eyes, and his white doctor’s coat made him look elegant and professional.

Across the room, another man leaned against the counter while drinking coffee.

This was Daichi Mori, Haruki’s best friend.

Daichi wore glasses and another white doctor coat. His posture was relaxed, but his eyes were sharp and intelligent.

He watched Haruki carefully bandage the cat.

“You spoil these cats too much,” Daichi said calmly.

Haruki laughed quietly.

“They’re patients.”

“They're spoiled patients.”

Haruki gently placed the cat inside a warm basket.

“It was injured in the street,” Haruki said. “Someone probably abandoned it.”

Daichi sighed.

“You're going to keep it, aren't you?”

Haruki looked at the cat for a moment.

Then he smiled softly.

“Maybe.”

Daichi shook his head.

“You already have three.”

“Four isn’t that many.”

Before Daichi could reply—

BANG!

A loud gunshot echoed from outside.

Both men froze.

Daichi’s expression immediately became serious.

“That sounded close.”

Another gunshot.

BANG!

Haruki frowned.

“Should we check?”

Daichi walked toward the window and carefully pulled the curtain slightly.

Outside, the street looked empty.

But far down the road…

Two black cars were parked strangely.

Then suddenly—

A man ran past the street corner.

He looked injured.

Blood stained his shirt.

Behind him, another car quickly turned the corner.

Daichi’s eyes narrowed.

“Gang trouble.”

Haruki looked worried.

“We should call the police.”

But before Daichi could answer—

The clinic door suddenly burst open.

The injured man stumbled inside.

He was tall.

Dressed in a black suit.

His breathing was heavy.

Blood ran down his side.

Haruki’s eyes widened slightly.

The man lifted his head.

Sharp cold eyes met Haruki’s gentle ones.

For a brief moment, the entire room became silent.

This man was Renjiro Kurogane.

Leader of the Kurogane Mafia.

But Haruki didn't know that.

He only saw an injured person.

Renjiro looked at Haruki carefully.

His vision was slightly blurry from blood loss, but he could clearly see the doctor standing in front of him.

Beautiful.

Calm.

Different.

Renjiro’s voice was low.

“Help me.”

Then his body collapsed forward.

Haruki immediately moved.

“Daichi! Help me!”

Both doctors caught Renjiro before he hit the floor.

Daichi frowned when he saw the wound.

“Gunshot.”

Haruki nodded.

“Bring him to the back room.”

They quickly carried Renjiro to the surgery room.

Inside the small surgery room, bright lights turned on.

Haruki carefully cut open the bloody part of Renjiro’s shirt.

Daichi crossed his arms.

“This guy is trouble.”

Haruki glanced at him.

“He’s a patient.”

Daichi sighed.

“Gunshot wounds usually come with dangerous friends.”

Haruki calmly cleaned the wound.

“Well he’s already here.”

Outside the clinic…

Two black cars slowly passed the street.

Men inside scanned the area.

But they didn't stop.

Inside the surgery room, Haruki carefully examined the wound.

“The bullet didn't go too deep.”

Daichi handed him surgical tools.

“You’re lucky tonight,” Daichi muttered while looking at the unconscious man.

Haruki focused completely.

His movements were precise and calm.

He removed the bullet slowly.

Blood stained the surgical cloth.

But Haruki didn't panic.

After years of medical training, he remained steady.

Finally—

The bullet came out.

Haruki exhaled slightly.

“All done.”

Daichi helped bandage the wound tightly.

After a while, Renjiro slowly opened his eyes.

His vision adjusted to the bright light.

The first thing he saw…

Was Haruki.

Standing beside the bed.

Looking down at him with calm eyes.

Renjiro stared silently.

His brain quickly processed the situation.

Small clinic.

Doctors.

Safe.

For now.

Haruki noticed Renjiro was awake.

“You shouldn’t move,” Haruki said gently.

“You lost a lot of blood.”

Renjiro studied him carefully.

The doctor didn't look scared.

Didn't look greedy.

Just calm.

Daichi stood beside the wall with crossed arms.

“You’re lucky my friend is nice,” Daichi said.

“Otherwise we would have thrown you outside.”

Renjiro ignored him.

His eyes remained on Haruki.

Then he slowly reached inside his coat.

Daichi immediately tensed.

But Renjiro only pulled out a black card.

A Kurogane Black Card.

Unlimited money.

He placed it on the table.

His voice was calm.

“Your payment.”

Haruki looked at the card.

Then he looked back at Renjiro.

And gently pushed the card back.

“I didn’t save you for money.”

Renjiro’s eyes narrowed slightly.

That answer was unexpected.

Everyone always accepted his money.

Everyone.

Haruki continued calmly.

“You can pay the normal medical bill later.”

Renjiro stared at him.

For the first time in many years…

Someone had refused his money.

Daichi noticed the strange silence.

He stepped forward.

“The bill will be about 30,000 yen.”

Renjiro ignored him.

His eyes still studied Haruki carefully.

Then he asked quietly.

“What’s your name?”

“Haruki Aizawa.”

Renjiro repeated it in his mind.

Haruki.

Strange.

The name stayed in his head.

Haruki noticed Renjiro trying to sit up.

“Don’t move.”

Renjiro ignored the warning and slowly stood.

Despite the injury, his posture remained powerful.

Daichi frowned.

“You’re going to reopen the wound.”

Renjiro adjusted his suit jacket calmly.

“I’ve had worse.”

Haruki sighed slightly.

“You should rest.”

Renjiro walked toward the door.

Before leaving, he stopped.

Then he looked back at Haruki.

Their eyes met again.

Renjiro spoke calmly.

“You saved my life.”

Haruki nodded.

“That’s my job.”

Renjiro studied his face one more time.

Then he left the clinic.

Outside, a black car quickly arrived.

Kazuki Takeda stepped out.

His cold eyes scanned Renjiro immediately.

“You disappeared for thirty minutes.”

Renjiro entered the car.

“I handled it.”

Kazuki noticed the fresh bandage.

“You went to a doctor?”

Renjiro looked out the window toward the clinic.

Inside, Haruki was gently feeding the injured cat again.

Renjiro spoke quietly.

“…Yes.”

Kazuki raised an eyebrow.

“Who?”

Renjiro didn’t answer.

Instead, he kept looking at the clinic window.

For some reason…

The image of that doctor refusing his money stayed in his mind.

Strange.

Very strange.

Renjiro leaned back in his seat.

But one thought repeated in his mind.

Haruki Aizawa.

Meanwhile inside the clinic—

Daichi watched Haruki cleaning surgical tools.

“You didn’t even ask who he was.”

Haruki shrugged slightly.

“He was injured.”

Daichi sighed.

“You're too kind.”

Haruki smiled softly.

“He’ll probably never come back anyway.”

Outside, the black car disappeared into the night.

Inside the car, Renjiro suddenly spoke.

“Kazuki.”

Kazuki glanced at him.

“What.”

Renjiro’s voice remained calm.

“Find information on someone.”

Kazuki smirked slightly.

“Who.”

Renjiro looked back once more toward the distant clinic.

Then he said quietly.

“Haruki Aizawa.”

Far away in the palace…

Something had already begun.

Something dangerous.

Something obsessive.

And neither of them knew it yet.

But fate had already connected their lives.

Morning arrived quietly in Kyoto.

Soft sunlight passed through the curtains of Aizawa Veterinary Clinic, lighting the small waiting area.

Inside the clinic, Haruki Aizawa stood beside a table, carefully writing notes in a medical file.

A grey cat slept peacefully in a basket nearby.

Haruki wore a clean white shirt with rolled sleeves. His hair was slightly messy from waking up early.

Across the room, Daichi Mori entered while holding two cups of coffee.

He placed one cup beside Haruki.

“You didn’t sleep much, did you?”

Haruki smiled faintly and took the coffee.

“Not really.”

Daichi leaned against the counter.

“Still thinking about last night’s mysterious patient?”

Haruki shook his head.

“I was thinking about the cat.”

Daichi stared at him for a moment.

Then sighed.

“You’re hopeless.”

Haruki chuckled softly.

The clinic felt peaceful again.

Almost like last night had never happened.

---

Across the city…

Inside a large glass building belonging to Kurogane Group.

The top floor office was silent.

Renjiro Kurogane sat behind his massive desk.

His expression remained cold as usual.

Stacks of documents surrounded him.

Across from him stood Kazuki Takeda, flipping through a tablet.

“I found information about your doctor.”

Renjiro didn’t look up immediately.

Kazuki continued.

“Haruki Aizawa. Age twenty-six.”

He swiped the screen.

“Veterinarian. Owns a small clinic with his friend Daichi Mori.”

Renjiro finally raised his eyes.

“Family?”

Kazuki read the next line.

“Younger brother. College student.”

Kazuki placed the tablet down.

“Clean background. No criminal connections.”

Renjiro leaned back slightly.

Silence filled the office.

Kazuki studied Renjiro carefully.

“You never investigate random doctors.”

Renjiro replied calmly.

“He refused my money.”

Kazuki smirked slightly.

“So you’re curious.”

Renjiro didn't deny it.

Most people saw Renjiro as an untouchable king.

But the truth was…

He rarely met people who treated him like a normal human.

Haruki hadn’t looked at him with fear.

Or greed.

That alone was… unusual.

Kazuki crossed his arms.

“Should I eliminate him?”

Renjiro’s eyes immediately turned cold.

Kazuki laughed.

“Relax. I’m joking.”

Renjiro spoke quietly.

“Leave him alone.”

Kazuki nodded.

But the small smile on his face remained.

Something interesting had started.

---

Later that evening.

Clouds slowly gathered above Kyoto.

Wind moved through the streets.

Rain began falling softly.

Haruki stepped outside his clinic with an umbrella.

The sky was grey and quiet.

Daichi stood in the doorway.

“You’re leaving already?”

Haruki nodded.

“I promised my brother dinner.”

Daichi waved lazily.

“Don’t get kidnapped.”

Haruki laughed.

“I’m a veterinarian, not a mafia target.”

He began walking down the street.

The rain slowly grew heavier.

Streetlights reflected on the wet road.

Haruki walked calmly while holding the umbrella above his head.

Then suddenly—

A loud car engine approached.

A black luxury car stopped beside the sidewalk.

Haruki instinctively stepped aside.

The car door opened.

And a tall man stepped out.

Haruki immediately recognized him.

The injured patient from last night.

Renjiro Kurogane.

He wore a perfectly fitted black suit.

Even with the bandage hidden under his shirt, his posture remained strong and elegant.

Rain fell lightly around them.

Haruki looked surprised.

“You shouldn't be walking around already,” Haruki said.

Renjiro stared at him quietly.

Up close, Haruki looked even more beautiful than he remembered.

Rain droplets landed softly on Haruki’s hair.

Renjiro spoke calmly.

“You’re the doctor.”

Haruki nodded.

“Yes.”

For a moment they simply stood in the rain.

Neither of them spoke.

Haruki finally said,

“Your wound might reopen.”

Renjiro glanced down slightly.

“It won’t.”

Haruki sighed.

“You’re a difficult patient.”

Kazuki stepped out of the driver’s seat and watched the scene silently.

His eyes moved between the two men.

Interesting.

Renjiro rarely stopped for anyone.

Renjiro looked back at Haruki.

“You refused my payment.”

Haruki replied calmly.

“I told you. I don’t help people for money.”

Renjiro asked another question.

“What do you want then?”

Haruki frowned slightly.

“That’s a strange question.”

Renjiro repeated calmly.

“What do you want?”

Haruki thought for a moment.

Then smiled gently.

“A peaceful life.”

Renjiro looked at him quietly.

Peaceful life.

Something Renjiro had never experienced.

Haruki adjusted his umbrella.

“You should still rest.”

Then he began walking again.

Rain continued falling softly.

After a few steps, Renjiro suddenly spoke.

“Haruki.”

Haruki turned back slightly.

Renjiro rarely called people by their name.

But somehow…

Haruki’s name felt natural.

Renjiro said calmly,

“You saved my life.”

Haruki shrugged slightly.

“That’s normal for doctors.”

Renjiro’s voice remained cold.

“I repay debts.”

Haruki smiled lightly.

“You already tried with money.”

Renjiro walked closer.

Rain touched his dark hair.

“Then I’ll repay it another way.”

Haruki looked confused.

“You don’t have to repay anything.”

Renjiro stared directly into his eyes.

“But I will.”

For a moment neither of them spoke.

Rain continued falling between them.

Kazuki watched quietly from the car.

His smirk slowly appeared again.

Renjiro Kurogane…

Was definitely interested.

Haruki looked at Renjiro one more time.

Then he said gently,

“Just don’t get shot again.”

He turned and walked away down the street.

Renjiro didn’t stop him.

Instead he watched silently until Haruki disappeared around the corner.

Kazuki walked closer.

“Well.”

Renjiro didn't answer.

Kazuki asked,

“So the scary mafia boss is following veterinarians now?”

Renjiro calmly returned to the car.

Kazuki opened the door.

“What’s the plan?”

Renjiro sat inside and closed his eyes briefly.

Then he said quietly,

“…Nothing.”

But in his mind…

Haruki’s calm smile remained clear.

For the first time in many years…

Renjiro felt something unfamiliar.

Interest.

Curiosity.

And something darker.

Something that slowly grew inside him.

Obsession.

Meanwhile across the city…

Haruki walked through the rain peacefully.

Completely unaware.

That the most dangerous man in Kyoto…

Had just started paying attention to him.

And once Renjiro Kurogane focused on something—

He never let it go.

---