Shinigami in the Ninja World

The Technological Development Bureau is a new department.

It was established only after Urahara Kisuke took office.

There are people here who are even more eccentric than Shinji Hirako.

People with horns growing out of their heads, wearing strange golden masks and dancing around... These are considered normal; they barely resemble humans.

Naruto even saw a green catfish sitting in front of a computer operating it.

Their attitude towards Urahara Kisuke is very strange.

There is no respect typically shown by subordinates to their captain; they are busy with their own tasks.

Urahara Kisuke didn't bother greeting these people either and led Naruto and Shihoin Yoruichi to the deepest level of the Technological Development Bureau.

A vast, empty, desolate place.

There was such a large underground space, even with a sky; it felt like another world.

He was also puzzled.

Why bring him here?

This place looked more like a training ground. If it was for a body check-up, the upper floors with sophisticated instruments would obviously be more suitable.

"Uzumaki, let me introduce this place to you." Urahara Kisuke spread his arms, his tone proud, "This is the first achievement I made after establishing the Technological Development Bureau."

"Here, we can evade any monitoring from Seireitei."

"Including... the restrictions from Central 46 on us Captains."

"Even a Bankai wouldn't be noticed by outsiders."

Naruto frowned.

This... doesn't sound like it's for "research".

"The seal on you is very intriguing." Urahara Kisuke approached, "Whether it's a Shinigami, Hollow, or Quincy..."

"Even the powers used by human mediums in the real world are completely different."

Urahara Kisuke paused and examined Naruto.

He originally didn't plan to interact with Naruto.

He saw Unohana Retsu's request for help as just ordinary colleague assistance.

But...

As his research into the "seal" deepened, and from the information he gathered about Naruto from Shinji Hirako,

He couldn't resist the urge to study the mystery within Naruto.

This had a unique resemblance to a kind of technology he was currently developing.

He continued, "That kind of technique's control over spiritual power is general, only a superficial application, but its ingenuity in physical development is extraordinary."

"The effects it shows are no less than our Shinigami techniques."

"A very unique perspective and approach, an area we haven't explored before."

"Unfortunately, I only have the transcripts given to me by Captain Unohana..."

Naruto lifted his shirt, "Do you want to see?"

"I don't mind."

"No, no, no." Urahara Kisuke shook his head quickly, "Those external forms are meaningless. I want to understand the operating core."

"So..."

"Fight!"

Naruto uttered a bewildered "ah," the transition too fast for him to react.

"Fight, release your sword and fight." Urahara Kisuke's voice was firm, decisive, and enthusiastic, "Until you lose control."

"I will record all the data to analyze the seal on your spiritual power."

Naruto hesitated.

Shihoin Yoruichi pressed down on Naruto's head, "Kid, losing control means you aren't familiar enough with your power."

"Use it more and you'll get familiar!"

"Don't worry about hurting us; even though Kisuke looks like this, he is still a captain."

Urahara Kisuke smiled, "And here, we are not restricted."

Naruto hesitated no longer, nodded, and drew his sword, "Then please, Captain Urahara, Captain Shihoin."

He chanted the release.

The ominous, fierce spiritual power of the Nine-Tails surged forth.

Soon, four tails appeared, and he lost his rationality, going berserk and mad.

When he woke up again,

Naruto found himself in a hot spring.

Shihoin Yoruichi, naked with a few bruises and scars on her body, greeted him cheerfully when she saw he was awake, "Yo, woke up? You sure hit hard."

She was very casual about it.

Naruto, embarrassed, blushed and averted his gaze.

He knew a similar technique to what Yoruichi was displaying now, but... doing it himself was one thing; soaking in the same hot spring pool with her was another.

A young man had never seen such a scene.

Urahara Kisuke was squatting by the hot spring, watching Naruto, his eyes glowing, "Your body has almost recovered?"

"Can you release it again later?"

"We collected some interesting data, but it's not comprehensive..."

Shihoin Yoruichi unhappily splashed a handful of hot water over, "Consider me, my stamina can't match this kid's."

That day,

Naruto lost control and released four times.

Urahara Kisuke was satisfied and arranged with Naruto to conduct such tests twice a week.

As for the compensation...

It would be the entire research result on the "seal."

And Shihoin Yoruichi's "Hand-to-hand Combat (Hakuda)" classes.

As one of the Captains, she was the strongest in terms of physical skills, and her guidance greatly benefited Naruto.

Two months later, Urahara Kisuke produced the first results.

On top of Naruto's existing seal, he added two more incantations.

The effects were remarkable.

They allowed Naruto to maintain his sanity in his four-tailed form and even further, only losing control when he reached the five-tailed state.

The "five-tailed form" brought a huge surprise to Urahara Kisuke.

A white bone mask appeared on the face of the out-of-control Naruto.

At first, he thought it was a Hollow's "mask," but after cutting off some parts with Yoruichi's help, he realized it wasn't.

It was purely "bone," completely different from the power of a Hollow.

However, it still provided new ideas for his research.

But...

The power of the "incantation" seemed limited to this.

No matter how many "support techniques" he added, it was impossible to keep Naruto sane in the "five-tailed form."

Urahara Kisuke was anxious.

He was eager to see what the "six-tailed," "seven-tailed," and even "nine-tailed" forms looked like.

This sword named "Nine-Tails" was stronger than he had imagined.

During this period, most of the time, it was Shihoin Yoruichi who fought with Naruto, but occasionally, Urahara would join to collect data.

Both came to the same conclusion.

The "five-tailed" Naruto had the level of the top Vice-captains.

If he could reach the "six-tailed" form... he might have the combat power of an ordinary Captain, roughly equivalent to the level of the newly appointed captain, Muguruma Kensei.

By this analogy, the limit of the "initial release" could potentially place him among the top Captains.

However, no matter how anxious Urahara was, he understood his limits.

Whenever Naruto was on the verge of further losing control and displaying another tail, Urahara would decisively step in to seal and cut off the spiritual power flow.

Research was conducted on the premise of ensuring Naruto's safety and also ensuring the safety of himself and Yoruichi.

Time flew by in training, learning, and research.

At the school's training ground.

Sosuke Aizen was teaching Naruto higher-level Kido spells above number fifty and suddenly remarked, "It's graduation season again."

Naruto was a bit dazed and replied, "Yes, graduation season."

He looked into the distance where the cherry blossoms were blooming again.

"Have you decided which division you want to join?" Aizen asked again.

Naruto shook his head, "Isn't the school responsible for the allocation after registration?"

"That's for regular students," Aizen smiled, "You're different, you're a genius."

"Even Captain Hirako wants to recruit you."

Naruto pondered, "5th Division, huh..."

"But speaking of which, Naruto, are you going to the living world with the sixth-year students for Soul Burials in a few days?" Aizen changed the subject, seemingly not wanting to make Naruto feel pressured or conflicted.

Naruto nodded and grinned, "Yes, Dean Hakou told me."

"Soul Burial" is the ceremony where a Shinigami consoles and sends souls to the Soul Society.

It's a skill every Shinigami must master.

Naruto was no exception.

He was looking forward to the internship in the living world.

Perhaps... This could solve the mystery of why he inexplicably traveled between "Konoha" and the "Soul Society."

The ceremony was simple, and the internship in the living world was more of a "symbolic gesture," representing that the students were finally stepping out of the school and becoming independent, formal Shinigamis.

"Best of luck," Aizen offered his blessings, "But given that you were personally taught by Captain Urahara and Captain Shihoin, I'm sure you'll be fine."

Naruto's smile widened, "And also the teachings of Vice-Captain Aizen!"

"If it weren't for you, I wouldn't have believed I could learn so many advanced Kido spells!"

"Just call me Aizen, we are friends after all," Aizen's tone was gentle and slow, "I'm just a mere vice-captain, how can I compare to the two Captains?"

"But... Naruto, you've improved much faster recently than before. Did those two Captains teach you something special?"

Naruto scratched his cheek, "Sorry, Aizen, Captain Urahara told me not to tell anyone about that matter."

Aizen apologized, "I overstepped. The guidance from the Captains is precious; you must cherish it well."

~~~

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