Perfected Demon Killer Technique

Chapter 8: Perfected Demon Killer Technique

Inside the cave, a pair of eyes, slowly filling with bloodshot veins, stared fixedly at the entrance.

Swoosh, swoosh!

A dense flash of cold light streaked past, and sharp kunai embedded themselves directly into the hard rock walls around them.

But when the strange man saw that the first things entering were neither a man nor a woman, but a cluster of kunai—each tied with sputtering, burning Exploding Tags—his pupils instantly contracted.

"Roar! None of them! Hah, then I'll just charge out and kill them all!"

Boom, rumble!

The next moment, a terrifying explosion echoed from within the cave, merging with the thunderclaps above.

"He's out!"

With a thunderous crash, as the figure emerged, Uchiha Mikoto shouted a warning.

But when she saw the person charging out of the cave, Uchiha Yoru revealed an expression of certainty.

Just as he thought! Mikoto's intel matched his expectations.

"Hahaha!"

The monster-like figure charging out laughed wildly, his face covered in terrifying black lines that were visibly spreading, constantly evolving, turning him into a true beast.

This wasn't a tattoo.

This was a Cursed Seal.

"Jugo! The Cursed Seal! A natural Sage Body!"

Seeing the figure, Uchiha Yoru showed a flicker of surprise. Beside him, Uchiha Mikoto exclaimed, "Yoru, you know about this?"

But at that moment, seeing the monster—especially the black lines still spreading across his body—Uchiha Yoru barked coldly:

"I've heard similar rumors. End this quickly—don't give his Cursed Seal time to evolve."

Without a moment's hesitation, the two moved in perfect sync, leaping onto two large trees.

The monster that had burst from the cave spotted his targets and burst into a mad, bloodthirsty laugh.

"Haha, blood! I want your blood!"

The frenzied monster charged straight at Uchiha Mikoto. Meanwhile, Uchiha Yoru, on the other side, began forming hand seals.

"Die!"

Sizzle...

The next moment, a piercing sound rang out, accompanied by the snapping of steel wires. The charging monster had fallen directly into a pre-laid trap of steel wires.

But under the enhancement of the Cursed Seal, the monster roared wildly and snapped the hard, sharp wires one by one.

Just then!

Fire Style: Great Fireball Jutsu

Uchiha Yoru gathered Chakra in his throat, then spat out a massive fireball from his mouth, hurtling straight toward the monster's back.

"Yoru!"

Seeing this, Uchiha Mikoto shouted as well. She quickly finished her hand seals and spat out a fireball even larger than Uchiha Yoru's.

Fire Style: Great Fireball Jutsu

Two enormous fireballs, one from the front and one from the back, converged on the monster. At such close range, the creature had no chance to dodge.

More importantly, the rampaging monster had no intention of dodging. Instead, it roared and swung its fists directly at the fireballs.

Brute force!

Boom, rumble!

The fireballs exploded under the curtain of rain. The echoing thunder and lightning overhead drowned out the sounds of battle.

Boom, rumble!

Exploding Tags and ninjutsu explosions reverberated through the forest. The monster, now battered and torn, had fully transformed—no longer human.

"Damn it! This monster can still evolve this strong!"

Panting heavily, Uchiha Mikoto stood on a tree branch, staring grimly at the distant monster. Beside her, Uchiha Yoru frowned deeply, his mind racing through memories.

In the original story, Snake Uncle only discovered Jugo's existence later on, which led to the development of the Cursed Seal.

This clan didn't possess a Kekkei Genkai—it was a special constitution, the Sage Body. Because they couldn't control the absorption of natural energy, it led to berserk rampages.

Berserk! Emotional instability!

Thinking this over, Uchiha Yoru made a decision on the spot and shouted:

"Sister Mikoto, use genjutsu! This monster is emotionally unstable—clearly unable to control this power. Use genjutsu to draw out the fear in his heart!"

With their innate trust, Uchiha Mikoto didn't hesitate. Her Two Tomoe Sharingan spun in her eyes as she formed hand seals.

Genjutsu: Hell Viewing Technique

In an instant, the monster beneath the rain curtain saw Uchiha Mikoto's Two Tomoe Sharingan, and its pupils trembled violently as its deepest fears surged to the surface.

"No! I didn't kill everyone, don't drive me away... don't..."

Countless memories flooded back, and the monster erupted into frantic screams, thick with terror.

From its raving, it was clear it had lost control, killed people from its own village, and been cast out.

As its wandering mind grew more unstable...

"Now's our chance!"

Seeing the monster break down in despair, Uchiha Yoru seized the moment, firing kunai with Exploding Tags from both hands.

He aimed for the monster's roaring mouth and throat—its vital points.

Boom! Boom! Boom!

As countless Exploding Tags detonated, the monster's mad howls were swallowed by the explosions.

Uchiha Mikoto let out a pained grunt, clutching her eyes as blood tears streamed down her cheeks. The strain on her Pupil Power from the genjutsu was immense—after all, she was fighting against natural energy.

Taking advantage of the chaos, Uchiha Yoru drew his sword and vanished into the smoke.

"No... I didn't kill everyone... I didn't..."

Schlick!

Blood sprayed as a blade pierced through its throat. The monster's body was half-severed from the explosions, yet it still rasped weakly.

Forbidden Jutsu: Oniichigo no Jutsu (Perfected Version)

Hidden in the smoke, Uchiha Yoru had already activated the forbidden technique sealed in his mind for twelve years.

He raised one hand, revealing a unique diamond-shaped curse mark on his palm, and pressed it against the creature's forehead.

In an instant, a powerful suction erupted from the mark.

The pull began devouring the creature's special constitution.

At the same time, the monster's form visibly receded, revealing its original appearance.

A gaunt, white-haired old man—devoid of any Chakra—yet capable of transforming into a monster by absorbing natural energy.

"Yoru!"

As the smoke cleared, Uchiha Mikoto rushed in with worry.

But when she arrived, all she saw was a mangled corpse pinned to the ground by a sword through the throat.

"I didn't... kill... every... one..."

Rain washed over the scene, pooling blood around them as the old man repeated hoarsely, his pupils fading.

Uchiha Yoru panted heavily, shaking his hand with a grim expression, inwardly shocked.

That old man was an ordinary person with zero Chakra—not like Jugo, who already had jonin-level strength. And at his age, this Curse Mark Sage Body is terrifying.

"Sister Mikoto, this intel was way off. If we hadn't brought enough Exploding Tags, we both might have died here."

At his teasing, Uchiha Mikoto's Sharingan remained fixed on the lifeless body.

Uchiha Yoru let out a long sigh. The diamond-shaped mark on his palm faded, replaced by faint curse mark patterns beneath his skin—barely visible before they vanished entirely.

The Perfected Demon Killer Technique could absorb and fuse bloodlines, but this perfected version required time and Stabilizing Agents to slowly adapt the body.

The forbidden technique is perfect, but the endgame still needs cash. He cursed inwardly. It's all a scam.

Originally, he'd planned to target a clansman with an Eye Awakening—less rejection from shared blood.

But the Curse Mark Sage Body was a rare find.

And now, he wanted to test a theory—one that could fit perfectly into his plan for Tsunade.

With that thought, Uchiha Yoru's expression turned serious.