Rasengan

Yamanaka Tohru formed the Ox-Rabbit-Monkey hand seals with both hands. [Chidori]

"[Chidori]? No, this is a nature transformation!" Namikaze Minato observed Yamanaka Tohru's ninjutsu. Kakashi had used [Chidori] as well, so he was quite familiar with this technique.

The Chidori in Yamanaka Tohru's hand gradually changed. "[Lightning Release: Lightning Beast Tracking Fang]!" Once the technique took shape, Yamanaka Tohru used Ice Release Teleportation to appear behind Minato and unleashed the Chidori's transformed form, [Lightning Release: Lightning Beast Tracking Fang]. His chakra was already nearly depleted.

"Space-Time Ninjutsu!" Yamanaka Tohru's sudden disappearance looked remarkably like his [Flying Thunder God], yet Namikaze Minato had not sensed any spatial fluctuations. He himself was extremely sensitive to spatial fluctuations—otherwise, he could never have learned [Flying Thunder God].

Yamanaka Tohru's technique was a shape transformation of [Chidori], changing its form into a wolf. The lightning wolf possessed lightning's speed and came with tracking abilities. Yamanaka Tohru did not know how far Minato had developed [Flying Thunder God], so he could only use Lightning Beast Tracking Fang together with his Ice Release to attack Namikaze Minato from both sides.

Having appeared behind Minato, Yamanaka Tohru used the last of his chakra to unleash [Chidori] once more.

Caught between Lightning Beast Tracking Fang and Chidori, Yamanaka Tohru was very curious to see how Namikaze Minato would respond without having placed Flying Thunder God markers in advance.

His Sharingan remained fixed on Namikaze Minato's every movement.

"Tohru, you really are outstanding. I underestimated you this time, but I don't want to lose to you either!" Before Namikaze Minato had even finished speaking, his Flying Thunder God Kunai shot toward Yamanaka Tohru.

[Flying Thunder God: Second Stage]!

Yamanaka Tohru no longer had enough chakra to maintain [Chidori]. Although Ice Release Teleportation consumed no chakra, without [Chidori], he had no way to harm Namikaze Minato. Without the boost of Lightning Release Chakra Mode, Yamanaka Tohru's taijutsu was absolutely no match for Kage-level Minato.

Namikaze Minato, who had developed [Flying Thunder God: Second Stage], was undoubtedly a Kage-level powerhouse.

But Yamanaka Tohru had not lost yet. As Namikaze Minato used [Flying Thunder God: Second Stage] to teleport, the lightning wolf closely pursued him.

Namikaze Minato was also aware of the lightning wolf behind him. Just as it was about to touch him, a pale blue sphere of chakra appeared in his left hand.

Yamanaka Tohru could not have been more familiar with the technique Minato used. It was Naruto's signature ninjutsu from the original story: [Rasengan].

The original story said that Namikaze Minato had spent three years developing this ninjutsu, but it never specified when exactly. Yamanaka Tohru had always assumed that Namikaze Minato had only completed it during the Third Shinobi War. He had not expected that Minato had already developed [Rasengan] in Year 40 of Konoha.

[Rasengan] collided with [Lightning Release: Lightning Beast Tracking Fang], and the two canceled each other out.

"Tohru, I think I won, didn't I?" Namikaze Minato said with his signature smile.

"Mm, Brother Minato, you won!" Yamanaka Tohru replied, panting heavily.

"Brother Minato, what was that technique you used at the end?"

"That's a technique I'm developing: [Rasengan]!"

"Brother Minato, it hasn't been completed yet?"

"Mm. [Rasengan] still isn't stable. I can form it, but it can only be maintained for a very short time."

Hearing this, Yamanaka Tohru understood. Namikaze Minato's development of Rasengan was already close to completion; he simply could not maintain the Rasengan's existence.

[Rasengan] gathered chakra in the hand, continuously compressing it in the palm. Its high-speed rotation created immense tearing force and tremendous destructive power. Being struck by [Rasengan] could not only severely injure an enemy, but also disrupt their chakra, greatly hindering their ability to use ninjutsu.

Moreover, [Rasengan] was a ninjutsu that required no hand seals and had many derivative techniques. In the original story, Naruto added wind nature transformation to Rasengan, evolving [Rasengan] into [Wind Release: Rasenshuriken], a technique of immense power.

Namikaze Minato's development of [Rasengan] was not yet complete. If Yamanaka Tohru helped Namikaze Minato finish [Rasengan] now, becoming one of its developers, he would be able to use this technique openly in the future as well.

For the sake of being able to use this technique in the future, Yamanaka Tohru decided to help Namikaze Minato perfect [Rasengan].

As Yamanaka Tohru rested, he chatted with the other three.

"Tohru, you developed [Chidori]? I always thought it was a technique Sakumo-senpai had passed down to Kakashi!"

Yamanaka Tohru nodded and told Namikaze Minato about [Chidori] and its derivative ninjutsu. Over the past two years, Kakashi had learned [Chidori Blade], and had also made some progress with [Chidori].

"Brother Minato, can you use [Rasengan] one more time?"

Namikaze Minato had also come to recognize the talent of the child before him. He had developed such a difficult technique as [Chidori], so perhaps he really could help perfect [Rasengan].

Namikaze Minato formed [Rasengan], and Yamanaka Tohru activated his Sharingan. To help Namikaze Minato perfect [Rasengan], he first needed to find out what was wrong with Minato's version.

[Rasengan] vanished after only three or four seconds. Through his Sharingan's observation, as well as the experience of having watched Naruto grind out Rasengan for five hundred episodes in his previous life—Naruto had only learned Rasengan after more than a hundred episodes—Yamanaka Tohru concluded that Namikaze Minato's [Rasengan] was not rotating fast enough.

"Brother Minato, the key to this technique is chakra compression and rotation, right?"

Namikaze Minato stared at Yamanaka Tohru in astonishment. He had researched this technique for two years, yet this child had seen through its principles in an instant.

"Brother Minato, I roughly know why your technique can't last long. Kakashi, go buy several dozen balloons, fill them with water, and bring them back. Also buy a few rubber balls." Kakashi, dragged into this for no reason, shot Yamanaka Tohru a vicious glare before going to prepare them.

Six-year-old Kakashi was quite efficient. Before long, he had bought the balloons and rubber balls. Kakashi opened his Sealing Scroll and took out the water-filled balloons and the rubber balls.

Yamanaka Tohru looked at Kakashi's Sealing Scroll with envy. It was high-end equipment and very expensive. Naturally, Yamanaka Tohru could not afford one.

Kushina noticed Yamanaka Tohru's gaze, lowered her head to glance at Kakashi's Sealing Scroll, and revealed a disdainful expression.

"Brother Minato, please release chakra at a steady rate until the water inside the balloon begins flowing irregularly and bursts it. Kakashi, you can try it too."

Namikaze Minato began bursting balloons as Yamanaka Tohru instructed, while Kakashi did the same beside him. Both were geniuses and quickly found the trick. Before long, Namikaze Minato had burst more than a dozen balloons.

"Brother Minato, next are the rubber balls. Input chakra just as before, but keep the chakra stable and use its rotation to tear apart the rubber ball."

Namikaze Minato continued training as Yamanaka Tohru instructed. After bursting three rubber balls, an enlightened expression appeared on his face.

[Rasengan] formed in his right hand once more. Unlike before, this time the Rasengan did not dissipate halfway through. Rasengan had been successfully developed!

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