The gate shimmered like a heat haze over a summer road, its edges crackling with purple energy that made the air taste of copper. Ren Akiyama stood ten meters away, his hands shoved deep into the pockets of his worn jacket, watching the senior adventurers file through the entrance.
None of them looked at him.
He was used to that.
The Fissure had opened three days ago in the industrial district of Shirokane City, swallowing half a warehouse and leaving behind a tear in reality that pulsed with a slow, breathing rhythm. Rank C, the assessors had said. Manageable. A team of twelve adventurers had been assembled to clear it.
Ren's job was simpler.
Wait until they finished. Go in. Collect the remains.
He was the Cleaner.
"Akiyama."
He turned. Hana Kirishima stood a few feet away, her hand resting on the hilt of a blade strapped to her back. Her guild emblem a silver crane glinted on her collar. Rank A. One of the strongest in the city. She was the only one who bothered to learn his name.
"Yes, Kirishima-san?"
"We'll signal when it's safe. Don't enter before then."
"I never do."
She studied him for a moment, something unreadable in her expression. Then she nodded once and walked toward the gate, her boots crunching on broken asphalt. The other adventurers gave her a wide berth, respect etched into their postures. Ren watched her disappear into the violet light.
Then he found a concrete block, sat down, and waited.
The sun crawled across the sky. His stomach growled. He'd skipped breakfast again cheaper that way. His apartment had rice and soy sauce, maybe a few vegetables if the neighbor hadn't taken them from the shared fridge. He pulled out his phone, checked the balance in his bank account. Not enough for next month's rent if he didn't get another job soon.
This Fissure was his third assignment this week. Low pay. No risk. That was the deal for rank F.
A crackle erupted from the gate. Ren looked up. The violet light flickered, dimmed, then flared bright again. Voices came through shouting, the clang of metal, a sound that might have been a scream.
He stood slowly.
The gate convulsed. A shockwave burst outward, throwing dust and debris across the parking lot. Ren shielded his face, squinting through the haze. The entrance was destabilizing, its edges fraying like torn cloth.
Someone stumbled out.
A woman young, rank D by her gear crawled through the threshold, her arm hanging at a wrong angle. Her face was pale, slick with sweat and blood. She saw Ren and her eyes widened.
"They're all dead," she gasped. "The floor collapsed. There's something something bigger than they thought. Get help. Get..
The gate pulsed again. The woman screamed as a barbed tentacle shot out, wrapped around her ankle, and yanked her back into the violet haze. Her fingers scraped against the ground, leaving red trails, and then she was gone.
Silence.
Ren stood alone in the parking lot, his heart hammering against his ribs. He should run. Get help. Find someone with a rank higher than D, someone who could actually fight whatever was inside.
His legs didn't move.
His eyes were fixed on the gate. The unstable edges. The way it flickered, like a dying lightbulb. If no one stabilized it soon, the Fissure would collapse. Everything inside would be lost. Including the bodies.
Including any survivors.
He thought of Hana. Her calm voice. The way she'd said his name like it mattered.
His feet carried him forward before his mind caught up.
The gate swallowed him whole.
Inside was wrong.
Not just the darkness, or the smell of ozone and decay. It was the geometry. The walls of the corridor curved in ways that made his eyes ache, and the floor beneath his boots was not stone or dirt but something that felt like dried skin. Fissures were supposed to be echoes of other worlds, temporary spaces that decayed after the creatures inside were cleared.
This one felt permanent. Hungry.
Ren moved forward, one hand trailing along the wall to keep his bearings. The corridor opened into a cavern a wide space littered with broken equipment, shattered weapons, and bodies. He counted seven at a glance. Some were still.
Others were not.
A man with a rank C badge on his collar was propped against a rock, his chest rising and falling in shallow gasps. His eyes found Ren. They were glassy, unfocused.
"You," he breathed. "The F-ranked. Why are you here?"
"I came to help."
A laugh rattled in the man's throat, wet and broken. "Help. There's no help. The boss. the thing that came out of the deep floor it's not rank C. It's not even B. We woke something up."
The floor trembled. From somewhere deeper in the cavern came a sound like grinding bones.
The man's hand shot out, gripping Ren's wrist with surprising strength. "Run. Before it senses you."
Ren looked at the bodies. At the equipment that cost more than his yearly income, scattered and broken. At the entrance behind him, still flickering, still unstable.
"I can't carry you," he said quietly. "I'm not strong enough."
The man's grip loosened. His eyes were already glazing over. "Then you'll die with the rest of us."
His hand fell.
Ren stood. He should go back. There was nothing here for him but another corpse to add to the count. The guild would send a proper team eventually. They'd retrieve the bodies. They'd give him his pay, meager as it was, and he'd go home and eat rice and pretend he hadn't seen the fear in the man's eyes.
Something clattered against his boot.
He looked down. A small bracelet, silver and tarnished, had rolled from the pocket of one of the fallen adventurers. He picked it up. The metal was cold against his fingers, and for a moment he thought he saw something move inside it .a glint of light, a shift in the shadows.
His sister had worn a bracelet like this.
The thought came unbidden, sharp as a knife. He remembered her hands, quick and warm, fastening the clasp before she left for her first Fissure. He remembered her smile. He remembered the day they brought him her badge and nothing else.
His grip tightened on the silver.
The grinding sound grew louder. The floor shook again, and this time it didn't stop. A crack split the cavern floor, zigzagging toward him. Ren stumbled back, dropping the bracelet. It hit the ground and burst.
Light exploded.
Not the violet of the gate, but something else—something blue and cold that pierced his eyes and drilled into his skull. His knees buckled. His hands flew to his face, but the light was already inside him, crawling behind his eyes, flooding his brain with symbols he couldn't read, numbers he couldn't count, patterns that folded in on themselves like origami made of fire.
He heard a voice. Not with his ears. It pressed directly against his mind, flat and mechanical, without warmth or mercy.
[Anomaly detected.]
He tried to scream, but his throat was locked.
[Host body: Ren Akiyama. Rank: F. Status: Deteriorating.]
The cavern dissolved. The bodies, the broken equipment, the trembling floor. all of it peeled away like paint stripped from wood. He was floating in darkness, and in that darkness, a window of light hung in front of him. Lines of text scrolled too fast to read.
[Subject shows compatibility. Initiating Protocol Zero.]
Pain lanced through his chest. He arched his back, his mouth open in a silent cry. Something was being planted inside him a seed of code, a worm of light that burrowed into his core and made its nest.
[Warning: Host rejection likely. Survival probability: 12%.]
Twelve percent.
The number echoed in his skull. He thought of his sister. He thought of the way she'd laughed when he tripped over his own feet, the way she'd pulled him up and said, Again. You don't stop until you get it right.
He didn't want to die here. Not alone. Not forgotten.
His hands clenched into fists.
Again.
The light inside him flared. The cold words stuttered, recalculated.
[Host resistance detected. Adjusting parameters.]
[Consent required for continuation. Do you accept the risk?]
Ren opened his eyes. The cavern was back, but different now. Overlaid on his vision was the same blue window, hovering in the air like a screen only he could see. The grinding sound was louder. The thing in the depths was coming.
He looked at his hands. They were trembling, but his grip was steady.
He thought about what the dying man had said. You'll die with the rest of us.
Maybe.
But maybe not.
He looked at the window, at the blinking cursor waiting for his answer, and he thought of all the years he'd spent cleaning up after others. Waiting outside gates. Collecting the scraps. Being nothing.
He pressed his palm against the light.
[Consent confirmed.]
[System installation complete.]
[Host reclassification in progress.]
The pain vanished. In its place, a cold clarity settled over him. The blue window transformed, splitting into multiple panels that displayed information he'd never seen before. His own status. The layout of the cavern. A countdown in the corner of his vision.
[Time until Fissure collapse: 00:14:32.]
[Objective: Survive.]
The floor exploded.
Ren threw himself sideways as a massive claw burst through the stone, missing him by inches. The creature that followed was not like anything he'd seen in the manuals. It was a bulk of twisted flesh and jagged bone, with too many limbs and a mouth that opened sideways instead of up. Its eyes seven of them, scattered across its head. all locked onto him.
The window flashed red.
[Threat level: A.]
[Recommendation: Evacuate.]
Ren's legs moved before he could think, carrying him toward the gate. But the creature was fast. A limb slammed down in front of him, blocking the corridor. Another swept from the side, catching him in the ribs and sending him crashing against the wall.
His vision swam. Blood filled his mouth.
The window flickered.
[Vital signs critical.]
[Searching for solutions…]
The creature lunged. Its mouth opened, rows of teeth spiraling inward like a tunnel of blades. Ren tried to move, but his body wouldn't respond. The broken ribs. The blood. The fear.
He was going to die.
And then the window changed.
[Solution found.]
[Would you like to override physical limitations?]
The words hung in the air. Ren didn't have time to think. He didn't have time to be afraid. He only had the memory of his sister's voice, and the echo of his own answer.
Again.
He said yes.
His body moved.
Not with his own strength something else pulled the strings, yanking him upright, twisting him out of the creature's path. His arm rose, his fingers extended, and for a moment he felt something gather in his palm. A weight. A heat.
The system displayed a single word:
[Execute.]
He struck.
The impact sent a shockwave through the cavern. The creature's head snapped back, bone cracking, and Ren saw something he'd never seen before in his life: a monster, rank A, staggered by a blow from an F-ranked Cleaner.
His arm dropped. The heat faded. The window flickered again, dimmer this time.
[Energy depleted. System entering standby.]
[Survival probability adjusted to 43%.]
The creature roared, but it didn't attack. It watched him with its seven eyes, and for the first time, Ren saw something in those eyes that made his chest tighten.
Fear.
It was afraid of him.
He didn't wait to see if that fear would turn to rage. He turned and ran, his body screaming with every step, the gate's violet light growing closer. He dove through it just as the countdown in his vision hit zero.
He landed hard on the asphalt of the parking lot, gasping for air, his ribs on fire, his mind reeling.
Behind him, the gate collapsed with a sound like a thunderclap, sealing the cavern and everything inside it forever.
Ren lay on his back, staring at the sky. The sun was setting. The clouds were pink and orange, peaceful. Normal.
But when he blinked, the blue window was still there, hovering at the edge of his vision.
[Host: Ren Akiyama.]
[Rank: E (provisional).]
[System status: Active.]
He closed his eyes.
When he opened them again, the window was gone. But he knew it was still there. Waiting. Watching.
He sat up slowly, wincing at the pain in his ribs. His jacket was torn, his hands were scraped, and his whole body felt like it had been put through a grinder.
But he was alive.
He looked at the spot where the gate had been. The air was clear now. No shimmer, no crackle. Just empty space and scattered debris.
He thought of the woman who had been pulled back inside. The man who had told him to run. The seven bodies he'd left behind.
And he thought of the thing in the cavern, with its seven eyes and its sideways mouth.
It had been afraid of him.
His hands were still trembling. Not from fear this time.
He got to his feet, steadied himself, and started walking toward the main road. His phone buzzed a message from the guild, asking for a status report on the Fissure. He ignored it.
He had more important things to think about now.
Like what the hell had just happened to him.
And what that blue window meant.
And why, for the first time in five years, he felt like he might actually be able to fight back.
He stopped at the corner, looking back one last time at the empty lot. The sun had set. The first stars were appearing, cold and distant.
But inside him, something warm was growing. Something that hadn't been there before.
Hope.