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Kaiju No.8: Monarch of Shadows

RSisekai
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Synopsis
The Japan Defense Force fights a losing war. Monstrous beasts known as Kaiju crawl from the depths of the earth, each one a walking catastrophe. Mankind’s hope rests on the shoulders of brave soldiers wielding advanced combat suits, but every victory is paid for in blood. Kafka Hibino, a man with the secret power to become Kaiju No. 8, believes he can turn the tide. He is wrong. During the most devastating Kaiju attack in recorded history, when all hope is lost and Japan's finest are on the brink of annihilation, the sky doesn't just crack. It shatters. From a rift of pure, silent darkness, a man emerges. He carries no weapon. He wears no suit. But the moment his feet touch the ground, every Kaiju in the world—from the mindless beasts to the intelligent humanoid threats—screams in primal, existential terror. His name is Sung Jin-Woo, the Shadow Monarch. He has finished one war, only to be thrown into another. But to a being who has slain gods and commands an army of immortal shadows, are these towering monsters prey or mere pests? As the Defense Force scrambles to understand this impossibly powerful being, they face a terrifying new reality: the greatest monster on their planet might just be their only hope.
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Chapter 1 - The Day the Color Fled the Sky

The air in Yokohama tasted of ozone and death.

Concrete dust, thick as morning fog, painted the world in shades of grim gray. The skeletal remains of skyscrapers clawed at a sky choked with smoke, their glass skins shattered, weeping steel entrails onto the ruined streets below.

BOOOM!

A shockwave ripped through the haze. A blur of white and gold, Kikoru Shinomiya, was blasted backward, her state-of-the-art Defense Force suit screaming a symphony of damage alerts.

WARNING: IMPACT-GEL PRESSURE AT 87%.

WARNING: SHOCK ABSORBERS OVERLOADED.

CRITICAL FAILURE IMMINENT.

She landed hard, skidding for fifty meters and carving a trench in the asphalt. Pain lanced up her spine. Every muscle fiber shrieked in protest.

"Kuh…!" Kikoru coughed, blood trickling from the corner of her lips. Her signature colossal axe felt like it was forged from lead.

Her opponent, a Designated Kaiju codenamed "Juggernaut," paid her no mind. It was a grotesque mountain of muscle and chitinous armor, its skin a mottled grey-green, and its face a nightmare of mandibles and too many eyes. A single number glowed on the command center monitors miles away: Resilience: 8.9.

A fortress that walks. A calamity given form.

"Shinomiya! Status report!" The voice of Vice-Commander Soshiro Hoshina crackled through her comms, sharp and strained.

SHIIIING—! SLISH!

Even as he spoke, his twin blades became streaks of deadly light, dancing around the Juggernaut's legs. He moved like a phantom, his specialized suit built for speed, not power. Each strike was aimed with surgical precision at the creature's tendons.

Sparks flew. The sound of high-frequency blades grinding against Kaiju hide was like a thousand nails on a chalkboard.

"Still breathing, Vice-Commander!" Kikoru grit her teeth, forcing herself to her feet. "But this thing… it's not taking any real damage!"

"I've noticed," Hoshina replied dryly, backflipping to avoid a thunderous stomp that pulverized the ground where he'd been a nanosecond before. *CRACK-A-DOOM!*

His internal thoughts were a storm of frantic calculations. 'Blade strikes are useless. Its regenerative speed is off the charts. We need overwhelming firepower.'

That was supposed to come from two sources. One was Kikoru. The other…

ROOOOOOAAAAARRRRR!

A sound of pure, unadulterated fury tore through the city.

A hulking, monstrous form, more Kaiju than man, slammed into the Juggernaut's side. Kaiju No. 8. Kafka Hibino.

The force of his punch sent a visible ripple through the Juggernaut's blubbery flesh. *THWUMP!* For the first time, the beast stumbled.

"HIBINO!" Hoshina yelled, though he knew Kafka couldn't hear him through his Kaiju roar.

Kafka, in his monstrous form, was their secret weapon, their hidden ace. But even he was struggling. His hardened knuckles were cracked and bleeding viscous green fluid. The Juggernaut was simply on another level. It absorbed his best punch, shook its massive head, and retaliated.

A swarm of thick, spear-like tendrils erupted from its back, lashing out at Kafka. He roared, swatting them away, but for every one he destroyed, three more took its place. He was being overwhelmed, tangled in a forest of razor-sharp flesh.

Miles away, in the sterile command center of the Third Division, Mina Ashiro watched the battlefield display with an icy calm that didn't reach her eyes. Red icons littered the map.

"Reno Ichikawa, provide cover fire!" she commanded, her voice betraying none of the desperation she felt. "Isurugi, Hoshina, we need to create an opening! My freezer cannon needs a thirty-second charge for a direct hit on its core!"

It was a losing battle. They all knew it. They had thrown everything at this single Honju-class monster, and it was still standing. They were at their limit. Hope was a flickering candle in a hurricane.

The Juggernaut finally trapped Kafka, wrapping him in dozens of tendrils and lifting him into the air. It then turned its attention to the two smaller threats on the ground. Its main, central eye glowed with a terrifying crimson energy.

A low hum filled the air, vibrating deep in their bones. The very atmosphere was condensing in front of its eye.

"This is bad," Hoshina muttered, his blades held at the ready, knowing full well they would be useless. "Shinomiya, fall back!"

Kikoru didn't move. She couldn't. Her pride, her legacy as the daughter of Isao Shinomiya, wouldn't let her. She hefted her giant axe one last time. 'If I'm going down, I'm taking a piece of you with me!'

This was it. The end of the line.

The beam was coming.

And then… it happened.

It didn't start with a sound. It started with a feeling. A pressure.

A sudden, impossible weight descended upon the world. It was not physical. It was absolute. The very concept of 'down' became heavier.

Hoshina stumbled, his knees buckling. "W-What is this…?"

Kikoru gasped, feeling as if the sky itself was pressing her into the ground.

Even the Juggernaut paused. Its crimson energy flickered. Its animalistic brain, which knew only rage and destruction, was screaming a single, primal word it did not understand: FEAR.

Then they looked up.

The sky, already a mural of smoke and despair, was breaking.

It wasn't cracking like glass. A deep, impossible line of pure, void-like nothingness tore across the clouds. It was not black like the night; it was a non-color that seemed to drink the light around it, a wound in the fabric of reality.

Mina Ashiro shot up from her chair in the command center. "What am I looking at?! What is that energy reading?!"

An operator, his face pale, frantically typed at his console. "Commander! I… I don't know! The readings are… they're blank! It's like a hole! No, it's worse—it's an immeasurable spike and a perfect zero at the same time! It makes no sense!"

The pressure intensified.

SILENCE.

The roaring wind died. The hum of the Juggernaut's charging beam vanished. The crackle of fires, the distant sirens—all of it was gone, suffocated by an aura so immense it choked the very air.

And from the center of the scar in the sky, a single figure dropped.

He didn't plummet. He descended.

He landed on the ruined asphalt with no sound. Not a whisper. He wore simple black clothes, looking utterly out of place in the warzone. His hair was black, his face impassive.

But his presence was a cataclysm. The ground for a hundred meters around him didn't crater from the impact. It simply fractured, splintering into a spiderweb of fine cracks from the sheer density of his existence.

His eyes… they glowed.

A deep, cold, violet-black light. The color of a dying star in the deepest void.

He stood there for a single, eternal second, taking in the scene. The broken buildings. The terrified humans in their power armor. The towering monster before him.

The Juggernaut, its fear overridden by aggression, roared and charged. A living mountain of death, thundering towards the silent man.

'A big lizard,' was Sung Jin-Woo's only thought.

He didn't move. He didn't even look at it directly.

He simply lifted a single hand, his fingers slightly curled. A quiet word escaped his lips, a word that was not spoken but felt, a command that vibrated in the souls of every living thing present.

"Arise."

The ground trembled.

From the shadow of a fallen Kaiju corpse nearby—a pathetic Yoju-class creature bisected earlier in the fight—something erupted.

It wasn't flesh. It wasn't bone.

It was pure, solidified darkness. A geyser of black and violet energy that swirled and coalesced with terrifying speed. In seconds, it formed a shape—a monstrous parody of a Kaiju, but wrought in shifting shadow, with glowing violet cracks all over its form and soulless lights for eyes. A Shadow Soldier.

It towered over the Juggernaut.

The charging Kaiju didn't even have time to process the new threat.

The Shadow Kaiju swung its colossal, shadowy arm.

SWOOSH—!

The sound of its passage was the sound of a hurricane being born.

KRAK-A-THOOOOM!

The impact was absolute. The Resilience 8.9 Juggernaut, the monster that had brought the Third Division to its knees, was swatted out of the air like a bothersome insect. It flew for half a kilometer, crashing through three derelict skyscrapers before finally coming to a stop, its nigh-indestructible hide caved in, its body a broken heap.

Dead.

Just like that.

Silence returned. More profound, more terrifying than before.

In the command center, a shower of sparks erupted from a console. Alarms blared and then abruptly died. Every screen showing the battle fizzled into static.

Mina Ashiro stood frozen, her hand covering her mouth, her professional facade completely shattered. "Did you see that…? Did anyone see that?"

On the battlefield, Hoshina's twin blades slipped from his trembling hands, clattering uselessly to the ground. His analytical mind, which could process a thousand variables a second, was blank. It had simply crashed.

Kikoru Shinomiya had fallen to her knees. Her axe lay forgotten beside her. She wasn't looking at the dead Juggernaut. She was staring at the man. Prodigy. Genius. The strongest rookie in Defense Force history. All those titles felt like ash in her mouth. She had just witnessed an act equivalent to a god swatting a fly.

And Kafka… trapped in his tendrils, he stared at the scene, his monstrous heart hammering in his chest. As Kaiju No. 8, he felt the world in a different way. He felt power. The Juggernaut was a wildfire. The Defense Force were sparks.

This man… this being… was the cold, endless vacuum of space. He wasn't on the same spectrum of power. He was the end of the spectrum itself. A predator beyond comprehension.

Sung Jin-Woo lowered his hand. The massive Shadow Kaiju silently melted back into his own shadow, as if it had never been.

He glanced around the ruined city, a flicker of confusion crossing his features. The air was wrong. The energy was absent. There was no mana.

His eyes, glowing with that terrible, beautiful light, scanned the horizon.

His internal voice was calm, a stark contrast to the world-shaking event he had just caused.

[Where... am I?]

And then, with a subtle distortion of the air around him, he was gone. Vanished.

Leaving behind a dead Kaiju, a silent battlefield, and a group of humanity's strongest defenders, who could only stare at the empty space where he had stood, their understanding of the world irrevocably broken.

In the dead quiet of the command center, with its fried screens and panicked operators, Mina Ashiro finally found her voice. It was barely a whisper.

"What in God's name was that?"