Blood Demon in Demon Slayer - Chapter 4

Chapter 4 — Territorial Dispute

The forest was his now.

Rai stood at the edge of the cedar grove in the early dark of the second night and thought about that. Not with pride — pride felt like the wrong register entirely — but with the specific, grounded practicality of someone taking stock of their situation before deciding what to do next. The forest was his because Haruto was no longer in a position to contest it. Two kilometres of old growth, ridge to ridge, creek to tree line, and somewhere within that perimeter a handful of villages whose lights he could see on clear nights as faint warm smears through the canopy.

His territory.

He’d never owned anything larger than a secondhand tablet and a small shelf of manga volumes.

He spent the first few days doing something between mapping and mourning — walking the boundaries of the space that had been Haruto’s, reading the forest through Haruto’s memories the way you might read someone’s diary after they were gone. Haruto had known this forest the way you knew a face you’d looked at for two centuries. Every deer path. Every hollow. Every section of creek where the water ran cold enough that the fish stayed close to the bottom. Every spot where the canopy thinned and left a gap of open sky — ‘dangerous, avoid’, the memory flagged, with the particular emphasis of hard-won experience.

It was strange, carrying someone else’s knowledge. Not intrusive — more like finding handwritten notes in the margins of a book you’d bought secondhand. The knowledge was useful. The person who’d written it was gone. Both of those things were true at the same time and Rai sat with the discomfort of that without trying to resolve it into something cleaner.

He was good at sitting with discomfort. Eight months in Room 214 had been an extended masterclass.

—

The days were still the problem.

He had thought, after the first interminable day trapped in the cedar hollow watching a beetle complete its domestic circuits, that he would adjust. That the inability to sleep would become background noise, a minor inconvenience he’d adapt around like adapting around any chronic thing.

He had not adjusted.

Every sunrise locked him into whatever cover he’d found before dawn — hollows, dense canopy, a small cave he’d discovered on the eastern ridge on day three, its mouth facing north and deep enough that even midsummer light wouldn’t reach the back of it. He’d claimed it immediately with the enthusiasm of someone who had been sleeping on roots. The floor was uneven and smelled of something that had probably denned here before him, and it was the most comfortable space he’d had since the hospital.

Which said something about the hospital, probably.

He spent the days thinking. Organising what he knew into categories, testing the edges of his abilities, watching his own stat panel the way you watched a plant you’d watered — checking for progress, recalculating projections, revising estimates.

The EXP was coming in slowly but continuously, a steady trickle that the panel tracked with the quiet consistency of a meter running. Haruto’s level-sixteen biology, absorbing into his own, converting into whatever internal currency the system ran on. He levelled on day four. Then again on day nine. The pace wasn’t fast but it was ‘reliable’, which was something that had been in short supply recently and which Rai therefore appreciated more than he’d expected to.

He tested ‘Flesh Manipulation’ on day six, carefully and alone.

He spent an hour in the back of the cave staring at the back of his hand and doing something he could only describe as ‘asking’ — the same mental gesture he’d used for the stat panel, for the Biological Absorption, except directed inward at his own tissue. Asking it to change. Not much. Just — move. Shift. ‘Do something’.

On the forty-third minute, the skin on the back of his knuckle rippled.

He stared at it.

It rippled again, deliberate this time, responsive, the texture changing and then returning, like muscle moving under direction. He could feel it the way you could feel your own fingers moving when you thought about them specifically — proprioceptive, intimate, weirdly natural.

He spent the rest of that day figuring out how far it went.

The answer was: ‘further than was comfortable to think about’. He could harden surface tissue. Soften it. Reshape bone at the cost of significant concentration and something that wasn’t quite pain but occupied the same general neighbourhood. He could extend fingers slightly, compress his own profile, alter the tension in his tendons in ways that changed how his body moved.

He filed all of this under ‘useful, investigate further, do not think about the implications at 3am’.

—

The level twenty threshold arrived on day twenty-eight, at approximately the same time as what had felt like a distant storm announced itself at the base of his skull.

Not a storm. A change.

He knew it before the panel updated. Felt it moving through him like a current finding a new path, something in his biology restructuring around a new capability the way water restructured around a new channel. It wasn’t dramatic. It didn’t hurt. It was more like the feeling of a key turning in a lock you hadn’t known was there — smooth, quiet, and final.

He pulled up the panel.

—

Demon: Lv22 (154/276)
Blood Demon Art: Blood Soldier

…

HP: 220/220
BP: 220/220

…

STR: 11 | AGI: 51 | VIT: 6 | SEN: 41 | BC: 1

…

Ability: Immortality, Regeneration (Lv2), Biological Absorption (Lv2), Flesh Manipulation (Lv2), Information Sharing (Lv2), Menacing Aura (Lv2)

—

He read ‘Blood Soldier’ three times.

Then he sat down on the cave floor, back against the wall, and thought about it for a long time without moving.

The ability was simple in the way that a loaded weapon was simple — direct, functional, and enormously consequential in the hands of someone willing to use it.

A dead target within range. The command. And then — not the person returning, he understood that clearly. Not resurrection. The blood remembered things. Muscle memory. Combat knowledge. Instinct. The ‘soldier’ that emerged from ‘Arise’ was made of his own Blood Power, shaped by the information the blood carried, operating with the skills and reflexes of whoever the blood had belonged to.

An army.

Not hypothetically. Literally. The limit was his level — twenty-two soldiers at twenty-two metres, both numbers climbing as he did. Every battlefield he walked away from was a potential recruitment pool. Every person he kill, every creature that died in his territory, every —

He stopped himself.

‘One thing at a time’, he thought. ‘You don’t have the Blood Capacity for any of this yet anyway. BC of one. You have the architecture and none of the infrastructure.’

He looked at the BC stat. One. The same as the day he’d woken up in blood. He hadn’t put a single point into it, which in retrospect might have been slightly optimistic — he’d assumed the Blood Demon Art would remain locked long enough that the investment could wait. Now it was unlocked and he had no fuel for it.

‘Add that to the list’, he thought. ‘Right after survive the night.’

He looked at his other numbers. AGI fifty-one. He rolled that around in his head, tried to map it against what he remembered of the series. Lower Moon demons were a gradient — some barely above feral, some genuinely dangerous. The upper end of that range was where he estimated himself now. Not dominant. Not untouchable. But fast enough that most things would have to work hard to catch him if he decided he didn’t want to be caught.

Running was still the plan. He was committed to the plan. The plan was good.

He was level twenty-two, in a body that wasn’t originally his, in a world that tried to kill anything like him on principle, and he was alive and improving and the knees still felt fantastic.

Everything was fine.

—

Haruto finished digesting on day thirty-one.

The panel noted it with the quiet efficiency it brought to everything:

[Digestion complete. Final EXP distributed.]
[All absorbed memories and biological data integrated.]

Rai sat with that for a moment. Then he said, quietly, to nobody in the dark of the cave: “Thank you.”

He wasn’t sure for what, exactly. For the forest knowledge. For the warning about animal blood. For the conversation, brief and broken as it had been, that had reminded him there were things in this world that had been human once and had tried to hold onto that, and had not quite managed it, and had kept trying anyway.

For the two centuries of survival knowledge now living in the back of his mind like a well-annotated textbook.

He closed his eyes for a moment. Then he opened them and stood up, because the hunger had found him again.

—

It didn’t announce itself with the explosive, body-seizing urgency of the first time. He’d been right about that, at least — that first night had been a threshold being crossed, a system calibrating to a new normal, and the new normal was something he could feel approaching rather than something that simply arrived and took the wheel.

But it was still hunger. Still the particular, climbing, ‘directional’ quality of a need that had opinions about what it wanted. And it was, after thirty-one days of passive EXP income and no hunting, overdue.

He stood at the cave mouth in the dark and breathed through it methodically, the way he’d breathed through pain in the hospital — not fighting it, just mapping it. Cataloguing. ‘This is what this feels like. This is where in my chest it sits. This is how it changes when I acknowledge it versus when I try to ignore it.’

It didn’t diminish under examination. But it also didn’t win. Not yet.

He had an advantage Haruto hadn’t had: he knew which parts of his biology to trust. The hunger was real. The hunger was also just a mechanic — a system requirement, like recharging a battery. It didn’t have to be catastrophic. It didn’t have to be uncontrolled. He could choose who. He could choose where. He could choose with the same deliberate practicality he’d applied to his stat points.

He thought about the villages within his territory. Several within two kilometres. He’d seen their lights.

He picked a direction and walked.

—

The village sat in a clearing at the western edge of the territory, a cluster of buildings that smelled of woodsmoke and rice and animals and the comfortable, layered smell of people living in close proximity to each other in the way generations of people had lived in close proximity to each other. Not large — twenty structures, maybe. A well at the centre. Fields beyond.

Rai stood at the treeline and looked at it from the dark.

‘Target’, he thought. ‘Someone alone. Someone on the edge. Someone who doesn’t—’

His lungs caught fire.

It wasn’t metaphorical. It was the specific, precise sensation of something in the air interacting very badly with his respiratory system — not smoke, not anything he’d breathed before, but something botanical, something that his demon biology flagged with the same absolute certainty it had flagged sunrise. He registered it a half-second before the context assembled: ‘Wisteria. They’ve planted wisteria.’

He stepped back instinctively. The sensation eased with distance. Three steps back and the burning dropped from ‘immediate crisis’ to ‘very unpleasant’. Five steps and it was a warning rather than an assault.

He stood in the dark and stared at the village with new eyes.

The wisteria was woven through the fencing at the village perimeter — he could see it now, looking for it, the vines worked deliberately into the structure, not ornamental. A barrier. A line of chemical warfare, passive and patient, saying: ‘nothing that this hurts is welcome here’.

‘Oh’, he thought. ‘Oh, this is why Haruto never—’

The figures came from the sides.

Not many — three, four — materialising from shadow with the practiced, unhurried movement of people who had done this before and found it routine. Young. All of them, the way Demon Slayers were always young, which was a fact that had been sad in the anime and was significantly sadder in person. They carried swords, and the swords had the specific faint luminescence of Nichirin blades catching available light.

Rai felt the danger of those swords in the same direct, bodily way he felt the wisteria — not intellectually but physically, some instinct screaming at the tier-one threat in a way that bypassed all the levels of processing between sensation and response.

“Found one,” the nearest Demon Slayer said. Not to Rai. To the others. His voice was professionally calm. This was a job. He was doing his job. “Stay sharp.”

‘Run’, every instinct said simultaneously.

But the first one was already moving.

The sword came fast — faster than Rai had expected, which recalibrated his estimates of normal Demon Slayer speed upward in a hurry. Not Upper Moon fast. But the movement carried the particular quality of trained reflex, technique layered over natural speed, Breathing doing exactly what the Breathing techniques were designed to do — compressing the gap between intent and execution until it nearly disappeared.

Rai moved.

Not toward. Sideways and back, the SEN giving him the attack vector a fraction of a second before the strike committed, the AGI carrying him clear with a margin that was embarrassingly close to not enough. He felt the displaced air of the blade. He felt the heat of it — Nichirin heat, sun-memory heat, the kind of warmth that was specifically and exclusively designed to disagree with his continued existence.

His hand was gone at the wrist before he fully registered the second Demon Slayer.

‘Oh that’s—’ he started to think, and then the pain arrived, and the thought didn’t finish, because pain on this scale didn’t leave room for sentence completion.

“Got an arm!” the second Demon Slayer called, with the tone of someone reporting mild professional progress. Not cruel. Just — noting it. Like ticking a box.

“Coward!” a third one shouted, as Rai was already moving. “Running already?”

Rai ran.

He ran with absolute conviction, the AGI fifty-one reducing the treeline from ‘over there’ to ‘here’ in the time it took the Demon Slayers to exchange three words about his retreat. He heard the voices behind him — ‘don’t let it reach the forest’, ‘cut it off’, ‘it’s heading north’ — and he processed none of it as information worth slowing down for because all of it was information pointing in the same direction, which was ‘faster’.

The forest received him. The voices fell behind. His wrist was regenerating — slowly, grinding, a process that felt like being built from the inside out — and he ran until the sounds of the village were completely gone, replaced by the familiar creek and the cedar grove and the ordinary dark of his own territory.

He stopped. Leaned against a tree. Looked at his half-regenerated wrist.

“Coward,” he said to himself, quietly, testing the word.

He thought about it.

Three Demon Slayers with Nichirin blades, wisteria perimeter, numerical advantage, the element of surprise, and a tactical setup that had clearly been prepared specifically for a demon approaching that village. And they were calling ‘him_ the coward for not standing there and dying cooperatively.

He looked at his wrist again.

“Absolutely,” he decided.

He was a coward. He was the most committed coward in the Demon Slayer universe. He would be a coward with both hands regenerated and a blood-fed survival rate that accumulated quietly while other demons died being brave.

He settled back against the tree and waited for the wrist to finish, and while he waited, he thought.

The wisteria meant planning. The formation meant coordination. The fact that three Demon Slayers were stationed at a village this size, in a territory this rural, meant the logging factory massacre had done exactly what he’d expected it to do — drawn attention. Sent Corps members into the region. Put every demon in the area under elevated threat.

Haruto had known which villages to avoid. He’d had two centuries to build that map. Rai had thirty-one days and a dead man’s memories, and the dead man’s memories hadn’t covered ‘current Demon Slayer deployment’ because Haruto hadn’t survived long enough to update them.

He needed to leave.

The thought arrived cleanly and without drama. He turned it over, checked it from a few angles, found no serious objections.

This territory was compromised. The factory had made it hot. The Demon Slayers stationed here were probably the advance element — if the Corps decided the situation warranted escalation, something above the level of three normal swordsmen would be coming next. He was level twenty-two with a BC stat of one. He was fast and perceptive and had an ability nobody in this universe had probably seen before, and none of that meant anything in the face of a Hashira who had been training their entire life to kill things exactly like him.

He needed new territory. Somewhere the Corps wasn’t already watching. Somewhere he could hunt without stumbling into a wisteria fence in the dark. Somewhere he could keep levelling, keep accumulating, keep building toward the thing he was building toward — whatever that was, exactly, which was a question he was still answering.

His wrist finished. He flexed the fingers experimentally. All present. All functional. The knees, as always, felt great.

He looked east, through the trees, toward the edge of his territory and whatever lay beyond it.

‘New ground’, he thought.

He started walking.