Shinigami in the Ninja World (Naruto x Bleach)

"Rasengan"?

A technique developed by my father.

Naruto was intrigued.

His current combat system was already relatively mature, and his need for "techniques" was not that high—Hadō was sufficient.

But after all, this was something from his father.

They had left few marks in their own lives.

Moreover...

The Summoning Technique also seemed to have some learning value.

Naruto recalled his first C-rank mission with Kakashi.

At that time, he saw him use the "Summoning Technique" to call forth a creature from a distant area.

It was a technique involving "space."

To this day, he had yet to understand the principle behind traveling between "this world" and the "Soul Society."

Kido involving "space" and "time" were explicitly forbidden techniques.

Without being part of the Kido Corps, it was impossible to obtain them in the Soul Society.

Tsukabishi Tessai was a good breakthrough point—he was the first person to clearly demonstrate a technique involving "time" and "space" in front of him, but he had escaped to the real world with Urahara Kisuke.

They were hiding well.

It seemed they were worried about that elusive enemy and had never attempted to contact him.

His investigation was also obstructed by the Central 46.

He hadn’t been able to find them.

Now, he needed a technique related to "space."

"Is the Summoning Technique related to space?" Naruto asked.

Jiraiya was momentarily stunned but nodded and replied, "Of course, it's a relatively basic space-time ninjutsu."

"Then, Jiraiya-sensei, please teach me these two techniques," Naruto agreed.

Jiraiya seemed thoughtful, "Naruto, are you interested in space-time ninjutsu?"

"Konoha has a ninjutsu called the Flying Thunder God Technique."

"It was also once used by your father, and it was his signature technique."

"Because of it, Minato earned the nickname 'The Yellow Flash,' which struck fear into the hearts of enemies."

"If you stay in Konoha, there might be a chance..."

Naruto interrupted him with a grin, "Was my father’s nickname 'The Yellow Flash'? That sounds really cool."

Jiraiya was at a loss for words, unable to continue.

He looked at Naruto and knew that those two evasive sentences were a silent rejection of his suggestion.

Indeed, a carrot tied to a stick could lure a "donkey," but how could it lure Naruto?

He walked over and, instead of taking out a scroll, demonstrated the technique to Naruto.

The Summoning Technique was not difficult.

The most important step was writing one’s name on the contract scroll.

Jiraiya took out the "Mount Myōboku Contract" and unfurled it.

Naruto glanced over the notes left by previous contractors.

Jiraiya’s name was second to last.

After him, the last name, written in sloppy kanji, was "Namikaze Minato."

Naruto wrote his own name on it. There were only five hand seals—it was a very simple technique, and he mastered it completely in less than an hour.

Looking at the toad he had summoned, Naruto was pensive.

He indeed sensed the spatial disruption and the ripple that opened a passage in an instant.

Unfortunately, Urahara Kisuke had fled.

He would have to conduct the research himself.

The Summoning Technique wasn’t just for summoning contract beasts.

"Non-living objects" weren’t restricted either.

Jiraiya suggested that Naruto engrave the summoning technique on the hilts of his dual blades.

If, during a battle, the twin swords are accidentally dropped, you can use the Summoning Jutsu to call them back. 

You can also use the Summoning Jutsu as a storage method, sealing items within a scroll and summoning them whenever you need to use them.

The second technique you need to learn is the "Rasengan."

A ninjutsu that doesn't require hand seals.

Naruto watched as Jiraiya held a rotating, azure blue sphere in his hand.

"Is this... developed based on the Tailed Beast Bomb?" Naruto asked.

The sphere gave him a strong sense of familiarity.

Jiraiya grinned and nodded, "As expected of Naruto, you recognized it at a glance."

"This is a technique that Minato developed for Kushina."

He paused, then waved his hand to disperse the chakra, "You've already mastered walking on water, and can even gather chakra to stand in the air."

"This shows that your control over chakra is extremely refined, far beyond my level."

"But these are all static uses of chakra."

"Rasengan is different; it requires chakra to flow."

"I'll stay with you during this time to teach you this technique..."

Before he could finish his sentence, his gaze fell on Naruto's hand.

In Naruto's palm, chakra flowed and twisted in one direction, stirring up a faint breeze.

But it was only a flat surface, far from forming a sphere.

Naruto adjusted the direction of the chakra flow while manipulating several streams at once.

The wind grew turbulent, and chaotic air currents swirled.

Gradually, the chakra became more concentrated, and a vague resemblance to the "Rasengan" began to form.

He increased his power.

After a few attempts, a bright blue sphere floated in Naruto's palm, "Jiraiya-sensei, is it like this?"

He had used the Tailed Beast Bomb many times before.

After successfully achieving "Four-Tails Transformation" with the help of Urahara Kisuke, he had also spent some time training with the Tailed Beast Bomb.

The principle behind the "Rasengan" technique was derived from the Tailed Beast Bomb.

Having this experience made it naturally less difficult for him.

Jiraiya watched, somewhat speechless.

Did he learn it so quickly?

He had hoped to use this opportunity to spend more time with Naruto.

But unexpectedly...

He had only demonstrated it once, and Naruto had already grasped the principle. In just over an hour, he had mastered it.

"Great job, Naruto." Jiraiya forced a smile, "You mastered it so quickly."

Naruto dispersed the chakra, "Thank you, Jiraiya-sensei."

"Then I'll be on my way."

He stood up, jumped onto a tree, and was about to leave with Shunshin.

Jiraiya called out to him, "Naruto."

The blond boy turned back.

"You said you're going to find your parents. What do you mean by that?" Jiraiya asked, voicing his greatest confusion, "Minato and Kushina are already dead."

"Where are you going to look for them?"

Naruto's voice was soft but resolute, "I know they’re already dead."

"But isn't there a Shinigami in this world?"

"Then there must also be a place where the souls of the dead are housed, right?"

"That's what I'm going to find."

Jiraiya was stunned, "The Shinigami? Where did you hear about that?"

"I saw it with my own eyes when the Third Hokage used a technique called the Reaper Death Seal." Naruto replied, "He summoned the Shinigami and sealed his own soul along with those of the First and Second Hokage."

"That Shinigami? You can see it!" Jiraiya's face darkened, and he furrowed his brow, "Where did you make a contract with that thing?"

Naruto looked over, "I haven't made a contract with it, but for some special reasons, I can see it."

"Jiraiya-sensei, you know that technique?"

"Then, could you please teach it to me?"

Jiraiya asked, "Are you sure you haven't made a contract?"

Naruto nodded, "I haven't."

"It's a relief that you haven't gotten involved with something so dangerous." Jiraiya let out a breath of relief, "As for that technique..."

"I'm sorry, Naruto, but I don't know it."

"After the Third Hokage's death, it’s likely that only Konoha has any records of it."

Naruto remained undeterred.

Jiraiya hesitated and then sighed, "You're so determined to leave Konoha and venture out; I can't stop you."

"Naruto, you're very mature and strong."

"So... there's something I think I should tell you.”