Naruto: Sasuke Uchiha Returns from Soul Society

"Urahara, you bastard!"

Just as he was analyzing the reasons for his failure, a purple afterimage appeared beside him.

Yoruichi grabbed his collar, her cat-like eyes blazing with anger. "Your experiment is too reckless! What if you had actually torn him in two just now?!"

"Oh dear, Miss Yoruichi, calm down, calm down."

Urahara quickly raised his hands, forcing a helpless smile. "The path of science is always full of small risks, you know. Look, Sasuke-kun is perfectly fine, isn't he? The core device is only slightly damaged..."

He chuckled and gestured with his eyes for Yoruichi to look at Sasuke.

Yoru turned his head and saw that Sasuke had recovered from the brief surge of blood and qi and was staring at them with an unfriendly look.

Although his face was still pale, his breathing was steady, and there were no signs of injury.

Yoruichi then released her grip, but still gave a disgruntled snort.

Sasuke raised his hand, wiped the trace of blood from the corner of his mouth, and stepped into the cage.

"So what do we do now?"

He looked at Urahara, his voice icy, clearly extremely dissatisfied with this failed experience.

Kisuke Urahara did not answer immediately. He squatted down, picked up a charred fragment of rune from the cracked metal ring, and examined it carefully.

After a long while, he stood up, casually tossed the fragment aside, and a smile returned to his face, though the smile didn't reach his eyes.

“External collisions won’t work. I admit I underestimated the rejection of these two forces once they leave your body.”

He readily admitted his mistake, then changed the subject, "But, Sasuke, any failed experiment is a success in itself as long as it provides enough data."

"And the data we just saw has shown us the only way."

Kisuke Urahara slowly opened his folding fan, covering the lower half of his face, and said in a low voice, "Since those two energies can only achieve a subtle coexistence within your body, then we will use your body as the core of the reaction."

"This conveniently eliminates the need for the energy fusion process."

The atmosphere was somewhat somber at that moment.

"Kisuke! Are you crazy?!"

Yoruichi's voice suddenly turned shrill at that moment, "Complete the collision inside his body?! Do you know what that means?"

"Once those two forces get out of control within him, he will be torn to shreds in an instant!"

"Miss Yoruichi, please don't get so agitated."

Kisuke Urahara, still sporting his usual carefree grin, pointed with his fan at Sasuke's waist, "Don't we still have an ace up our sleeve?"

"The Hogyoku?" Yoruichi frowned.

"That's right, that's the guarantee."

Kisuke Urahara's eyes deepened. "It can materialize 'desire,' capturing Sasuke's strong will to 'live on' and 'go back to that world.'"

"Once the energy conflict within his body reaches the critical point that Sasuke's body can withstand, it will automatically intervene and absorb all the energy that is about to get out of control, thereby protecting Sasuke's soul from being completely torn apart in the storm."

Yoruichi's breathing faltered slightly, and a growing unease settled in her heart.

She knew that while Urahara's theory sounded reasonable, the risks involved were far greater than he made out to be.

Moreover, according to her understanding, that little madman would likely agree with this statement.

"I agree."

As expected, Sasuke spoke up immediately afterward.

"Kid!" Yoruichi turned her head sharply.

“This is the only feasible method.” Sasuke’s voice was calm. He looked at Yoruichi, his eyes unwavering. “The risk and reward are equal. You should understand this principle better than I do.”

Sasuke knew very well what it would mean for him to master the method of freely traveling between the two worlds.

"You..." Yoru looked at his resolute face, and all the words of persuasion stuck in her throat.

"Fine, fine." In the end, she could only sigh helplessly and glare at Urahara resentfully. "You better make sure your theory actually works!"

"Of course, of course."

Kisuke Urahara closed his fan with satisfaction, then immediately turned around and began to repair and modify the damaged equipment.

"Hey, Urahara." Yoruichi followed, her cat-like eyes still full of confusion. "I still don't understand. Wasn't it supposed to be enough to let those two powers collide? Why did we have to fuse them inside his body first?"

"Oh dear, Miss Yoruichi, you just don't understand."

While rapidly adjusting the parameters on the control panel, Kisuke Urahara explained without turning his head, "A simple collision is like two stones hitting each other. Although it can produce sparks, they are too weak and too unstable."

"The energy fluctuations generated after fusion and then detonation are much greater. Although it is a bit dangerous, the chances of success will increase exponentially."

He pointed to the metal pillars that had lit up again, "Look, I've completely redesigned its function; now it's an 'energy amplification and focusing field.'"

"It will create a high-pressure energy field that envelops Sasuke and then continuously pour the purest spiritual energy into his body."

"Sasuke-kun, are you ready?" Kisuke Urahara turned around and made an inviting gesture to Sasuke.

Sasuke didn't answer, but simply took another step and stood in the center of the field once more.

"So......"

Kisuke Urahara's hands hovered over the main control crystal.

"The experiment begins again."

The moment the words fell, a massive stream of spiritual particles surged into Sasuke's body like a flood bursting its banks.

That instantaneous burst of power was enough to annihilate an ordinary Grim Reaper.

"Ugh..." Sasuke's body trembled violently.

Initially, thanks to his powerful spiritual pressure and willpower, he was able to barely maintain the balance between the two forces within him.

However, with the continuous influx of external spiritual particles, that balance was completely broken.

Chakra and spiritual power, like two enraged beasts, clashed and tore wildly through his meridians and soul.

"This...this level of spiritual pressure..."

Outside the cage, Yoruichi's face showed a look of horror.

The surge of spiritual energy felt to her as if all the power of the spear used in the execution of Shuangji had been compressed into his body.

"Stay calm, Sasuke!" Yoruichi's voice came from outside.

Sasuke gritted his teeth, his crimson Sharingan spinning wildly in his eye sockets.

"Isn't this going too far?!" Yoruichi asked anxiously.

"No, that's not enough!" A bead of cold sweat appeared on Kisuke Urahara's forehead, but his hands didn't stop working on the control panel. "To open that door, we need an energy singularity powerful enough to warp space! That's far from enough!"

Inside the cage, Sasuke's body finally reached its limit.

"Click".

A faint cracking sound came from beneath his skin.

Immediately afterwards, cracks appeared and spread across his body like a spider web.

Black flames and white lightning spilled uncontrollably from the cracks.

"Uh... Ahhh..."

The pain caused Sasuke to let out a suppressed growl, and his consciousness began to blur.

But his determined heart remained firmly locked on his only thought.

"go back!"

"Go back to that world!!!"

And it is in this final desire that one reaches the peak.

"Buzz—!!!"

The purple crystal at his waist, which had been dormant, suddenly shone brightly, its purple radiance soaring into the sky!

A vast power instantly swept over Sasuke's entire body.

It ceased its dormancy and directly absorbed the two energies within Sasuke's body that were on the verge of completely spiraling out of control, along with all the spiritual energy torrents poured in from the outside.

The entire energy cage was filled with a pure purple color at this moment.

"Did it work?!" Yoruichi's heart jumped into her throat.

Kisuke Urahara was still curiously observing when, in an instant, the world lost all sound and color.

A white beam of light, indescribable in any words, emanated from Sasuke's body and spread outwards in layers.

Yoruichi and Kisuke Urahara were completely deprived of all their senses in that instant.

They can't see or hear anything.

All one could feel was a powerful energy storm sweeping in.

It was pure white.

........

Sasuke's consciousness was being forcibly pulled back from the pure white void.

That was an extremely unpleasant experience.

It's like countless fragmented memories, emotions, and perceptions, which are then roughly kneaded, squeezed, and ultimately reshaped.

First came the dizziness of tearing space apart, followed by excruciating pain in the soul, and finally, a deathly, icy silence.

When Sasuke regained consciousness, he hadn't even realized where he was before his fighting instincts took over his body.

A power filled with death and hatred was frantically eroding through the two crossed blades in his hands.

Sasuke suddenly opened his eyes.

What came into view was a dimly lit stone chamber.

The familiar scene is Konoha's Namendo.

At this moment, he was holding two swords crossed, desperately blocking a short sword that emitted a cold, eerie blue light.

The one holding the short knife was a hideous ghost hand wrapped in cursed seals.