"Rasengan is a ninjutsu created by the Fourth Hokage, Namikaze Minato, inspired by the Tailed Beast Bomb. He and I spent three years creating it."
Jiraiya's face carried a look of reminiscence.
Hearing that Ryosuke wanted to practice the Rasengan, Jiraiya, who was carrying out a mission away from the village, specially rushed back.
They came to a training room used specifically for practice. Sitting across from Jiraiya were two people.
One was Ryosuke.
The other was Naruto.
Anyway, teaching one or two makes no difference. After all, this ninjutsu originally belonged to Naruto's father.
Jiraiya had originally planned to pass it on to Naruto when he was older. But, considering that during the last attack from the Hidden Cloud, Naruto had already been able to draw on the Nine-Tails' power, Jiraiya thought, 'Perhaps, the time has come.'
It was just that Naruto's attention was completely not on Jiraiya.
He tilted his head to look outside the window. Sasuke and Sakura were pressed against the glass, each sticking out half their faces, smiling as they waved at him.
Naruto also grinned wide in response.
A big hand suddenly grabbed Naruto's little head, forcefully twisting his face back.
Naruto found himself looking straight at Jiraiya. He shrank his neck a little, letting out an awkward "hehe" laugh.
Jiraiya withdrew his hand, cleared his throat, and continued, "The full name of Rasengan is 'Light Wheel Ice Cream Stick Initiated Spinning Hair Jiraiya Double-Form Ball', Ryosuke, you don't need to remember this. But Naruto, you have to memorize both names."
"Eh? Why?"
Naruto protested the unfair treatment.
Jiraiya didn't explain, and instead continued describing the principles of the Rasengan. He extended one hand, chakra rapidly spinning and condensing in his palm. With faint, rapid wind-like sounds, the Rasengan appeared in his hand.
"Rasengan does not require hand seals. You only need to condense chakra in your palm, let it continuously flow in irregular directions, and compress it, forming a 'chakra sphere' with high rotational density.
The high-speed rotation of chakra itself already carries tremendous power."
"You two can try first. Condense chakra in your hand, that's the first step of training."
Naruto, being impatient, had already stretched out his hand to start trying.
Of course, this wasn't a simple technique. Naruto also didn't have the genius ability to instantly master it, but his persistence was more than enough. He buried his head in trying again and again.
Ryosuke, however, wasn't in a hurry.
He quietly observed the Rasengan in Jiraiya's hand.
Seeing his focused gaze, Jiraiya leaned over and asked, "See anything?"
Ryosuke nodded slightly, "Inside your Rasengan, there are roughly five to six thousand tiny chakra threads rotating irregularly."
"One thread vanishes, then another is born from your palm… is this something you're deliberately controlling?"
"Fi-five, six thousand?"
Jiraiya was dumbfounded, "I don't know… when you cook rice, do you deliberately count how many grains you put in?"
He only had a rough sense, it was about this amount of chakra, tossed into the palm and set to spin.
Ryosuke understood the difference between Rasengan and Golden Rotation.
Rasengan pursued speed of rotation. As long as you continuously add chakra, or infuse Tailed Beast chakra, Sage power, or other forces into it, its destructive power will keep increasing.
Rather than a ninjutsu, Rasengan was more like a "platform."
The more enhancements you attach, the stronger the corresponding Rasengan becomes.
But Golden Rotation pursued a very specific arc of rotation, the "Golden Ratio Spiral" that aligns with the natural laws of the world. It bestowed miraculous power upon an otherwise ordinary ball.
When the user threw the iron ball, it was like throwing out a key that pried open the power of the world. By using the rotation's force, they borrowed the world's strength to annihilate their opponent.
It had to spin according to the precise technique of the Golden Rotation, not the irregular spin of Rasengan.
"I get the general idea now," Ryosuke said.
"You get it?"
Jiraiya was doubtful, about to ask what exactly Ryosuke understood.
Then he saw Ryosuke raise his hand. In his palm, golden lightning flickered and spun, strands of lightning linking together, forming elongated, delicate golden flames.
Finally, a golden Rasengan burning with flames appeared in Ryosuke's hand.
Jiraiya's mouth hung half open.
To think, just ten minutes ago, Ryosuke couldn't even tell the difference between a Rasengan and a beef meatball. He'd only listened to Jiraiya's explanation of the principle and watched one demonstration…
And now he could do it?
On the side, Naruto looked down at his empty palm. After condensing chakra for so long, all he managed was to squeeze out a fart, which stirred up a breeze, but nothing else.
He squinted at Ryosuke.
'What! What! What!'
'What are they even talking about!'
Naruto leaned close to Jiraiya's ear, poked his finger at Jiraiya's cheek, and whispered unhappily, "How come just by saying things like 'rice' and 'cooking rice,' Big Brother Ryosuke can already do it? Are you guys speaking in some kind of secret code I can't understand?"
'Secret code, my ass.'
Jiraiya just stared at that mass of golden, flaming, high-speed spinning Rasengan.
"No wonder, not long after Ryosuke left Konoha, he gradually revealed such terrifying dominance on the battlefield… what a frightening talent!"
Sensing both their gazes, Ryosuke shook his head slightly.
He wasn't some ninjutsu genius. It was just that the principle behind Rasengan happened to perfectly match what Ryosuke was best at, "energy manipulation."
This was also only the simplest step, and Ryosuke was not satisfied with just this.
"You two, step a little further away from me," Ryosuke reminded.
Just one simple sentence made Jiraiya's heart skip a beat. He quickly tucked Naruto under his arm and hurried to the corner of the training room.
Ryosuke took a deep breath, his pitch-black eyes suddenly sharp.
BOOM!
Thunder roared through the vast training chamber.
The chaotic spinning ripples, under Ryosuke's control, shifted from disorder to order. Each ripple rotated with the exact Golden Rotation technique.
As the process unfolded, the thunderous roar gradually faded, leaving only a faint, almost imperceptible high-frequency ringing sound, like "shhh, shhh," in the ears.
Ryosuke stared at the Golden Rotation: Rasengan floating above his palm.
'Would it work?'
The instant the thought flashed by, the skin, muscle, and bone of his palm began collapsing inward, twisting.
The spinning force was rapidly transmitting through his flesh and blood, it looked like Ryosuke was about to turn into a protagonist from a Junji Ito horror manga.
Bang!
Fiery golden flames scattered in all directions. A dozen or so fire fragments flew toward Jiraiya and Naruto's direction.
Jiraiya was just about to form hand seals for Earth Release, when several purple vines shot out, intercepting all the flying flames.
Jiraiya breathed a sigh of relief, about to thank Ryosuke, when he noticed Ryosuke's right arm hanging unnaturally, blood dripping down.
"Ryosuke!"
Jiraiya exclaimed, running over in big strides, "Are you alright?!"
"No problem. To be precise…"
Ryosuke looked at his broken bones and heavily damaged muscles, then slowly revealed a smile.
"I got the feeling of it."
'Got the feeling?'
Jiraiya was a bit dazed.
Ryosuke took a deep breath. Natural energy surged into his body, blood that had dripped began to flow back, broken bones knit together, muscles and skin regrew. In the blink of an eye, his arm was back to normal.
"Let's continue."
"I've grasped a little of the trick now."
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