Blood Demon in Demon Slayer - Chapter 5

Chapter 5 — Red Hands

He left before midnight.

Not because he’d planned to leave at midnight specifically, but because midnight was when the SEN finally caught what it had been half-registering for the last hour — movement on the western edge of the territory, coordinated, multiple presences spreading out in a pattern that wasn’t hunting and wasn’t patrolling but was something in between. Something that was drawing a perimeter.

They were surrounding the mountain.

Rei felt it through the forest the way you felt weather coming — not with your eyes but with the whole surface of you, the air changing before the change arrived. He was already packed, which was a generous way of describing the fact that he owned nothing and therefore had nothing to pack, and he was through the eastern tree line and into unfamiliar terrain before the Demon Slayers on the western slope had finished tightening their net.

He didn’t look back.

There was nothing behind him worth looking back for. A cave with an uneven floor. A two-kilometre forest he’d inherited from a dead man. The ash of his own severed finger, long since scattered. He kept moving east, and the mountain fell away behind him, and the darkness ahead was just darkness — open, unknown, and his.

The terrain changed under his feet as he moved. The dense old growth of the logged territory gave way to scrubland, then to a valley, then to a road that was wide enough to suggest it saw regular use. Haruto’s memories stopped at the mountain’s edge, clean as a cut — ‘here is where I lived, and here is where I stopped’. Beyond that, the memories that surfaced were older, thinner, belonging to someone else.

Rai’s memories. The body’s original tenant, still present in fragments the way a previous owner’s preferences showed up in a house — a preference for certain routes, a vague familiarity with certain landmarks, a sense of ‘this direction means town’ that Rei hadn’t earned and was therefore quietly grateful for.

He followed the road east.

—

The sky was beginning to think about changing colour when the town appeared.

‘Town’ was optimistic. It was larger than any of the villages in Haruto’s territory — more buildings, more density, the smell of more people layered into the air like sediment — but it didn’t have the weight of a proper city. More like a place that had started as one village and absorbed two smaller ones over several generations without anyone formally deciding to. The buildings crowded together with the comfortable, unplanned intimacy of things that had grown rather than been arranged.

The hunger had been climbing for the last hour of walking. He was acutely aware of it now — that directional, climbing need, pulling at the back of his throat, sharpening every smell that reached him into something more immediate than information. The town smelled of people sleeping, of woodsmoke from banked fires, of food and animals and all the accumulated warm biology of a settlement of this size. His body catalogued all of it with an attention that had nothing to do with his preferences and everything to do with what he’d become.

He breathed through it. Found the rhythm. ‘Acknowledged, registered, not acted upon.’

He needed shelter before the sky changed further. That was the immediate problem. Everything else was downstream of still being alive when the sun went down again.

He found the abandoned house on the third street he tried — a building that the SEN identified as unoccupied before he reached the door, nothing inside generating the particular pattern of a living presence, no warmth, no breath, no small movements. The door opened when he pushed it with a sound like something that hadn’t been asked to move in a long time and wasn’t sure it wanted to start now.

Inside: the smell of old wood and dust and absence. A room, mostly empty. A second room with a broken shutter hanging at an angle from one hinge. A back wall without windows that would stay dark all day.

It was fine. It was enough.

He pulled the broken shutter as far closed as it would go and found a corner where no line of light could reach, and he stopped moving, and he breathed.

The town woke up slowly around him. He could hear it — the SEN turning ambient noise into a map, individual sounds resolving into activities. Someone crossing a street. A cart beginning to move somewhere north. A child’s voice, distant, asking something in the specific tone children used when they asked things before they were fully awake.

He had all day.

He looked around the room, and found, on the wall near the broken shutter, the remnant of a mirror.

Most of it was gone — the frame empty on one side, the glass surviving only in a roughly triangular piece in the lower corner, old and slightly warped the way old glass was. But large enough to reflect. Large enough, when he moved in front of it, to show him something.

He stood there for a while.

The face looking back at him was — he tried to find the right word and kept arriving at the same one. ‘Wrong.’ Not wrong the way a stranger’s face was wrong, though there was that too — he still hadn’t fully made peace with the fact that the face wasn’t his. But beyond the Rai-ness of it, beyond the fact of inhabiting someone else’s features, there was a quality to the face that the face hadn’t had in the blood field.

Rai had been handsome. He knew this from the body’s memories the way he knew Rai’s name — not with evidence but with the certainty of something that had simply always been known. Good bone structure. The kind of face that got looked at and then looked at again.

What was looking back at him from the mirror fragment was not that.

The skin had a cast to it — not quite the grey of illness, not quite the pallor of someone who never saw daylight, but something in between, something that landed in the register of ‘this person is not well’ and then kept going past it into ‘this person is not quite right’. The eyes were the worst part. Not red, like Muzan’s — just different in a way he struggled to articulate. Flatter. The light in them sitting at a wrong depth, like looking at a photograph of eyes rather than eyes themselves. And around them, just barely, the beginning of the vascular patterning that Rei had watched spread across demon faces in the anime as they aged and hungered — faint, blue-black, visible under the too-pale skin like rivers seen from altitude.

He looked like a corpse wearing its own face.

He looked, he thought with a flatness that surprised even him, like exactly what he was.

‘Previous Rai was apparently really good-looking’, he thought. ‘That’s unfortunate for both of us.’

He turned away from the mirror and sat down in his corner and waited for the day to pass.

—

The hunger was not patient.

By the time the light through the broken shutter had moved through its full arc and was beginning to go amber, it had become the loudest thing in the room. Not painful yet — not the crisis it had been on that first night, before he’d learned to pace himself, before he’d had the prison idea. But loud. Insistent. The kind of noise you couldn’t have a second thought over, that kept interrupting everything else he tried to think about.

He thought about the prison while he waited.

He’d thought about it during the walk, turning it over, checking it from angles. It was a reasonable solution to a problem that didn’t have many reasonable solutions. The problem was: he needed blood. The problem adjacent to that was: he did not want to hurt people, in the general abstract sense of ‘people are people and hurting them is bad’. These two problems were not easily reconciled when you were the kind of thing he was, in the world he was in, with the needs he had.

But criminals were a gradient.

He was not going to pretend that every person behind bars in a Taisho-era prison was irredeemably monstrous. He wasn’t naive. Justice systems in any era were complicated, and the complicated parts usually fell heaviest on the people who already had the least. He knew that. He held that knowledge.

He also held the knowledge that a prison population, statistically, was going to contain people who had done real harm to other people. Murderers. Violent offenders. People whose removal from the world would generate more relief than grief in the people who had known them.

He was a demon. He needed blood. He was doing triage on his own ethics in a corner of an abandoned house while a hunger that didn’t care about his ethics climbed steadily up through his chest.

The sun went down.

He stood up.

—

Finding the prison took most of the first hour. It wasn’t where Rai’s borrowed memories suggested anything might be — his mental map of this town was thin and incomplete — but the SEN did the work, triangulating from the sounds and smells of a larger, more heavily populated structure on the northern edge of the settlement. Guards. A controlled perimeter. The particular quality of a building that was designed to keep its occupants inside.

He circled it twice from a distance, mapping it the way he’d mapped his territory — not rushing, not committing to anything yet, just watching the information arrive and arrange itself into a picture.

Guards on the main entrance. Two. Rotating on a schedule that the SEN clocked at roughly forty minutes between position changes. Windows on the upper floor barred. Ground level: barred, shuttered. A rear wall that faced away from the main road, less lit, one guard who was doing the rounds with the energy of someone who had decided an hour ago that nothing was going to happen tonight.

‘Nothing is going to happen tonight’, Rei agreed, internally. ‘I’m going to make sure of that.’

He went over the rear wall between the walking guard’s circuits, landed in the inner yard without sound, and found a ground-floor window whose bar had been slightly loosened by years of rust. He applied the AGI and the Flesh Manipulation — bones briefly narrowing, shoulders compressing in a way that felt profoundly incorrect and that he chose not to think about too carefully — and was inside before his own doubt could catch up.

The interior was dark and smelled of stone and damp and the accumulated unhappiness of people who had been here a long time. His eyes resolved it easily. A corridor. Cells on both sides. The sounds of people sleeping in the particular, restless way people slept when they were uncomfortable and had long since accepted being uncomfortable.

He stood in the corridor and breathed.

He had thought about this. He had done the math of his own ethics carefully and arrived at a position he could stand in. He had framed it correctly in his own head, categorised it, justified it in terms that held up under examination.

He moved to the first cell.

The door opened when he put pressure on the weak point of the latch — the SEN showing him where the mechanism was through the wood, the Flesh Manipulation-hardened fingers finding the gap and working it with a patience the night had plenty of. Inside: one figure, asleep, facing the wall.

Rei stood in the open door for a moment.

He thought about Room 214. About the ceiling with the dog-shaped water stain. About counting down the days in a hospital bed with a body that was slowly refusing to keep doing its job, and how in those months the thing he’d wanted, more simply and more completely than he’d wanted almost anything, was more time.

He thought about that.

Then he moved.

It was fast. And it was easy. And that was the part — the part that would stay with him, that would sit in his chest alongside the disgust and the relief and the hunger-satisfaction and all the other complicated residents of his new interior life — the part that was ‘easy’. Not the doing of it. The doing of it was simple, functional, a body completing a task, and then a weight on the floor and a smell in the air that his demon biology processed as resource rather than loss.

He had been twenty-three years old and dying slowly in a hospital, and he had known what death felt like from the inside, the long approach of it, the terrible patience of it. He had catalogued it the way he catalogued everything.

He had not expected it to feel this weightless from the other side.

He drank. The EXP notification arrived with its usual quiet indifference.

[+100 EXP]

He went to the next cell.

—

He moved through the floor with a systematic thoroughness that had its own kind of horror — not frantic, not desperate, but deliberate. Each cell. Each EXP notification arriving like punctuation. The level-up alerts came in clusters after a while, the numbers climbing, and he tracked them with the part of his mind that was always tracking things even when other parts of his mind would rather it didn’t.

Level 23. 25. 28.

On the 31 — a man in the last cell at the end of the corridor, who had been awake when Rei arrived and had looked at him with an expression that moved through confusion and then horror and landed somewhere beyond both — he stood back and looked at the floor.

Thirty-six. Total of thirty-six.

[Level Up! Calculating progression…]

Demon: Lv31

He looked at his hands. The blood on them looked black in the dark of the corridor, which was somehow worse and somehow better than if it had looked red.

‘You knew what you were’, he told himself. ‘You’ve known since the first night. You’ve had entire month to know it.’

Knowing and being were different things.

He had known that intellectually too.

He stood there for a moment, in the dark with thirty-six empty cells and his own black-blooded hands, and he felt disgusted and satisfied and hollow and alive, all four of them with equal conviction, none of them cancelling any other out. The mess of it. The unresolvable, ongoing mess of being this, doing this, surviving as this.

He would sit with it later. He had a Blood Demon Art to try.

He pulled himself into the present — firmly, deliberately, the way you gripped a railing on a moving surface — and focused.

‘Arise.’

The word left him quietly, barely a whisper.

But the blood heard it.

The circle spread from his feet like a slow exhale, dark red bleeding into the stone floor in all directions, reaching outward in a perfect radius that he felt through his own body — his own Blood Power flowing out, extending, searching. It found them cell by cell, the dead registering as information to the spreading circle, the blood reading what had been there.

Then they rose.

Not dramatically. Not with the sudden lurching violence of something forced back against its will. They simply — stood. One after another, in the cells and the corridor, thirty-one of them within the radius, each one assembling from the blood that had left them and the Blood Power he was extending, and standing in their own spaces with the particular stillness of things that had no needs of their own and were waiting for direction.

They looked like the people they had been.

Except the colour was wrong — deep red, blood-red, every surface of them the red of something that was made of the substance rather than merely containing it. And the edges of them, where they met the air, flickered with something he couldn’t name — a dark energy, red-edged, that moved like heat haze and didn’t act like anything he had words for. It made them look like something out of a nightmare. Which, technically, he supposed they were.

He stood in the middle of thirty-one blood-red soldiers in a prison corridor and thought: ‘this is the most unsettling thing I have ever been responsible for, including everything else.’

[Blood Soldiers summoned: 31/31]
[BP consumed: 310]

He blinked.

Read that again.

“Oh,” he said. Out loud. To nobody. “Right.”

He dismissed them. They dissolved back into nothing with the same quiet efficiency with which they’d assembled, the energy withdrawing, the corridor emptying, the blood retreating. He filed away the discovery that he could overdraw his BP, apparently, and that doing so had consequences he hadn’t yet explored, and that he needed significantly more BC investment before this ability was anything but theoretical.

He stored what he could — 31 soldiers, the cap his current level could theoretically maintain — in the Blood Realm, which operated like a pocket he could reach into, and released the rest.

He turned toward the exit.

The guard at the end of the corridor was standing very still, lantern raised, staring at him with an expression that had left ordinary fear behind several minutes ago and was now operating in territory that didn’t have a name.

“What,” the guard said. Very quietly. “‘What.'”

Rei looked at him. At the lantern. At the exit behind the guard that was now blocked by a guard.

“Move,” Rei said, “and I won’t hurt you.”

The guard did not move. The guard made a sound instead — short, involuntary — and then shouted. Loud. The kind of shout that was designed to travel through walls.

Rei moved.

The guard lurched into his path and swung the lantern like a bludgeon — not trained, just desperate and large and committed to the movement, and Rei ducked under it and felt it pass through the air above his head with real force. He was through the gap before the guard could reset, running now, and the prison was waking up around him the way a body woke up in response to pain — fast, disorganised, loud.

The inner sections. He’d moved deeper than he’d meant to during the systematic work of the floor, and the path back to the loose-barred window was now in the wrong direction. He recalculated. The SEN mapped the guards assembling ahead — three, four, moving with more urgency than the outer perimeter had suggested they were capable of — and he took a different corridor, one that went up rather than out.

The first guard on the stairs came at him with a spear, which was unexpected — he’d thought spears were more of an outdoor weapon — and the tip caught his side before his AGI could fully close the distance. Not deep. His VIT absorbed the worst of it, the flesh knitting even as he registered the damage, but it still ‘hurt’ with the specific clarity of a reminder that his VIT was six and had received very little investment.

‘Fix that’, he noted, somewhat urgently, for later consideration.

He grabbed the spear haft and pulled the guard forward off-balance, stepped past him, kept moving. Another guard at the top of the stairs got his feet knocked out from under him by someone falling backward — chain reaction, unplanned, but he’d take it. He was through a room full of startled guards who had very much not expected whatever had come up the stairs at them, and his Flesh Manipulation was hardening his knuckles as he moved, bone-hard and dense, and he cleared a path with his forearms more than his fists because hitting people was not something he was good at and shoving people out of his way while moving fast was something the AGI made intuitive.

The outer wall.

He hit it running and the Flesh Manipulation did something to his legs that was probably not great for the long-term structural integrity of the joints, and he cleared the top of the wall in one movement that didn’t feel entirely governed by normal physics, and he landed on the other side in the dark of the outer road in a crouch that absorbed the impact better than it had any right to.

Behind him, the prison was fully awake and very unhappy about it.

He ran.

The town blurred past. He took turns at random — not random, the SEN guiding him away from concentrations of activity, toward the quieter streets, toward the edge of things. The shouts fell behind him, and then away, and then were swallowed by distance and the ordinary sounds of a town being a town at an hour when most of it didn’t know anything had happened.

He didn’t stop until the buildings thinned out and the road became a path and the path became the edge of something that might be called countryside if you were generous.

He stopped. Breathed. Looked down at himself.

His side had closed. The guards’ wounds were healing. His hands were — he looked at them in the dark, turned them over, looked at the back and the palm and the spaces between the fingers.

He was level thirty-one. He had thirty-one potential Blood Soldiers waiting in the Blood Realm like pieces on a board. He had confirmed that his Blood Demon Art worked, that the Flesh Manipulation worked under pressure, that his AGI was fast enough to make a messy exit from a very bad situation without dying in it.

He had also killed thirty-six people tonight, and four guards on the way out, and his hands felt clean because demon blood and demon metabolism didn’t leave the kind of evidence that human hands left, but they weren’t clean, and he knew they weren’t clean, and he was going to know that for a long time.

‘You’re alive’, said the part of him that always said that. ‘You made choices. They weren’t good choices. They were survival choices. You’re alive.’

He looked at the road ahead. East. Unknown.

He thought about the anime he’d rationed in a hospital bed. About Tanjiro, who had cried for every demon he’d ever killed, who had held the hands of things that had done monstrous things and seen the human being underneath and mourned that too.

Rei didn’t have that in him right now. Maybe he never would. He didn’t know.

What he had was the road. And the night. And the next territory ahead of him, and the level-ups still to come, and sixty stat points not yet spent, and a Blood Demon Art that had just demonstrated its potential in a prison corridor full of red-lit soldiers who had stood and waited for direction with the absolute patience of things that had nowhere else to be.

He started walking.