Naruto: Sasuke Uchiha Returns from Soul Society

Sasuke's voice was calm, "When I first returned to the ninja world from the human world, there was no powerful energy collision as you described."

He recalled the scene that day, "If I had to put it into words, I only killed a Hollow that could be considered a small fry."

Upon hearing this answer, Kisuke Urahara's smile not only didn't fade, but instead became even brighter.

"That's the crux of the problem, Sasuke-kun."

"Do you remember? You once told me that during that time travel, a cold voice appeared in your mind."

"Hmm." Sasuke nodded slightly, his voice lowering. "Now that I think about it, that must have been 'Indra' before it fully manifested."

"Completely correct."

Kisuke Urahara's lips curled into a smile. "So, Sasuke-kun, have you ever considered the true nature of the power of your Zanpakuto, 'Indra'?"

"nature......"

Sasuke instinctively drew the long, jet-black sword, looked at his calm eyes reflected in the blade, and began to explain.

"If my intuition is correct, this sword is formed by the fusion of the power of 'hollow' and a peculiar 'chakra' within me."

He could sense that the peculiar chakra shared the same bloodline as the Uchiha, yet it was even more ancient. However, he did not yet know the true meaning of this power.

“That’s right, this is it!” Urahara Kisuke’s fan ribs lightly touched Sasuke’s black sword. “Now, all the clues are connected.”

"Each of your journeys is accompanied by a clash between two different power systems in two worlds!"

"The first time, it was the seed of 'chakra' and 'hollow power' belonging to the ninja world within you that collided for the first time under the external stimulus of killing a Hollow, and it also opened the door to your homeland!"

"The second time was when you used Takemikazuchi, which represents the power of death, to clash with that fox spirit."

"And later, during your Bankai trial, you used your Shinigami powers to fight against the fusion of 'Hollow' and 'Chakra' within you!"

"Every time you travel through time, it's a direct collision between the power of this world and the power of that world, either inside or outside your body!"

This passionate conclusion caused the air in the entire passage to freeze.

Just then, a lazy voice drifted from Sasuke's shoulder.

“But Urahara, Sasuke, that brat, has used his so-called chakra in our world before.”

Yoruichi flicked her tail, her cat eyes filled with confusion. "Why wasn't he teleported away back then?"

Sasuke also turned his gaze to him, waiting for an explanation.

"Oh my, Miss Yoruichi, you've really hit the nail on the head."

Kisuke Urahara scratched his head helplessly, a troubled expression on his face. "This is exactly what I can't fully understand right now."

"This shows that this is the only commonality I have found so far."

He looked at Sasuke and gave a logical conclusion.

"The only explanation is that the clash of different forces between worlds may not necessarily lead to your time travel."

"However, each of your journeys will inevitably be accompanied by a clash of these forces."

"This is a classic case of a necessary but not sufficient condition, right?"

Yoruichi was a little confused, but she roughly understood what Urahara meant.

"So?" She tilted her cat head. "After all this talk, what's the conclusion?"

"The conclusion is that there must be some opportunity that we do not yet know about."

He grinned, giving Sasuke a hopeful smile. "That's why we need to use experiments to verify it, isn't it?"

"Then what does this experiment have to do with the Hogyoku?" Sasuke asked casually.

They had now arrived at the familiar underground training ground.

"Don't rush, don't rush, the show is about to begin."

He led Sasuke and Yoruichi to an open space in the very center of the training ground.

There, a circular platform consisting of several huge metal pillars had already been erected. Between the pillars, faint blue light curtains made of ghostly energy appeared and disappeared, forming an airtight energy cage.

In the center of the cage, a strangely shaped metal ring floated, engraved with countless complex runes that Sasuke could not understand.

"This is..." Yoruichi jumped down from Sasuke's shoulder and examined the device in front of her with great interest.

"I call it the 'Soul Flow Collider,' just a boring little toy that can extract and collide energies of different natures," Kisuke Urahara explained casually.

He turned his head to look at Sasuke: "Sasuke-kun, do you know what the core ability of the Hogyoku is?"

Sasuke's eyes flickered slightly.

"It is to visualize the 'human hearts' that exist around us and their desires."

Kisuke Urahara's voice became meaningful, "What we lack now is not the energy of the collision, but an anchor that can stabilize the possibilities generated at the moment of the collision."

He pointed to Sasuke's waist.

"And the Hōgyoku is the best anchor."

"It can capture your deepest desire to 'go back,' and then, at the moment those two forces collide, it will materialize that desire and forcibly teleport you back."

“That’s how it is in theory,” he added as a final remark.

Yoruichi said speechlessly, "You're never very reliable when you say things like that."

Kisuke Urahara smiled and waved his hand: "Experiments always have successes and failures."

"..."

Sasuke was silent for a moment, then asked directly, "What should I do?"

Chapter 161 Hogyoku, Return!

What should I do?

In response to Sasuke's questioning, Kisuke Urahara pointed to the center of the energy cage formed by a light blue light curtain.

"It's very simple, Sasuke-kun."

"All you need to do is stand directly under that metal ring and leave everything to me."

"Hey, Urahara."

Upon hearing Kisuke Urahara's words, Yoruichi nimbly leaped off Sasuke's shoulder and then circled the massive metal pillars, her tone full of doubt.

"Is this thing really reliable? I smell a cheap metallic odor about it."

"Excuse me, Miss Yoruichi, this is my masterpiece. Please feel free to leave it to me, a professional." Kisuke Urahara's tone was full of confidence.

Sasuke glanced at him, clearly also skeptical of this seemingly overly simplistic request, but didn't ask any further questions.

He took a step and calmly walked into the pale blue light curtain.

The light curtain rippled like water the moment he passed through, then quietly closed behind him.

Soon, a faint sense of restraint came from all directions.

He looked up at the metal ring floating above his head and finally stood still as instructed.

After confirming that Sasuke was in place, Kisuke Urahara's smile faded slightly as he walked to a more complex control panel outside the cage.

"Alright, let's begin," he reminded them, his hands already flying across the control panel.

With a low hum, the metal pillars around the cage lit up instantly, and two completely different forces locked onto Sasuke.

"Hmm..." Sasuke frowned slightly.

A pulling force originates from the depths of the soul, slowly drawing outward the pure spiritual power belonging to the Grim Reaper.

The other source originated from his limbs and bones, stripping chakra outwards from every part of his body.

But the whole process was eerily smooth, like two docile sheep.

Outside the cage, Yoruichi watched the scene unfold with a solemn expression.

Two distinct streams of energy, one blue and one purple, were being steadily drawn from Sasuke's body. Then, like two intertwined streams, they flowed slowly from opposite ends of the device toward the central metal ring.

The two energies gradually approached, swirled, and intertwined in the core area of ​​the ring, seemingly about to merge together.

The surrounding space was thus subtly distorted.

"What a beautiful sight!"

Kisuke Urahara stared excitedly at the two energy streams on the control panel.

However, just a moment before they were about to merge.

"—Beep! Beep! Beep! Warning! Energy repulsion index has instantly exceeded the limit! The core area cannot maintain stability!"

A piercing alarm blared wildly throughout the underground training ground.

On the control panel, the crystal used to monitor energy stability suddenly burst into a blinding red light.

"What?! The repulsive force is three orders of magnitude higher than I expected?!" Urahara's excitement was instantly replaced by astonishment, and his eyes became serious.

Almost simultaneously, the two forces within the metal ring that were about to merge collided violently.

Those two originally docile energies, after being separated from Sasuke for a long time and without guidance during their fusion, generated considerable repulsion from the outside world.

"Bang--!!!"

A dull, loud bang.

A large number of electric sparks instantly erupted from the surface of the metal ring, and several fine cracks spread out between the runes.

The two surges of rampaging energy then flowed back towards Sasuke's body along the path they had come from.

Sasuke felt a tightness in his chest, a metallic taste rising in his throat, and he staggered backward half a step uncontrollably, his face instantly turning pale.

The energy cage behind him also flickered violently a few times under the impact of the energy backflow, emitting a piercing electric sound, before finally dimming.

A pungent, metallic smell filled the air.

"...It failed."

Kisuke Urahara looked at the core device, its surface covered in cracks, then at the pale-faced boy in the cage, and murmured softly.

He strode forward, shut off the power supply to the entire device, his face full of confusion.

"External collisions won't work; outside the body, the repulsion between these two energies far exceeds my calculations..."