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"Naruto, remember, this technique is called the Rasengan. It's an A-rank ninjutsu developed by the Fourth Hokage," Jiraiya said solemnly.
"That one, right?" Naruto pointed at the Shadow Rock monument.
Isn't that just the Fourth? I know that. My over-the-top, chuunibyou dad. I even know about the "Spiraling Flash Super Dance Roar Triple Technique."
"Yeah, him. He was a genius."
Naruto nodded. Indeed, a genius—the greatest in naming talent throughout the entire Naruto series.
"It took him three years to create it. I don't know if you'll be able to master it." Jiraiya's expression grew complex as he felt the weight of passing on a legacy—transferring the strength of the previous generation to the next.
But this wasn't something he should have been doing. It should've been you, Minato, who taught him.
Jiraiya gazed at the statue of the Fourth Hokage, lost in memories.
"Master Jiraiya, look!"
A blond youth held his hand up, a glowing Rasengan hovering above his palm, its blue hue matching his eyes.
"Minato, look."
He imagined himself holding the Rasengan in front of the blond youth, the blue orb reflecting his azure gaze.
Jiraiya turned back to Naruto's bright blue eyes. Kid, even though the generational lines are blurred, I still have to pass this down to you.
"Don't worry, I'm awesome!" Naruto declared confidently.
This body was practically made for the Rasengan. Naruto half-jokingly wondered if, during his early days competing with billions of other embryos for position, he'd squeezed into existence in a spiraling motion.
"Naruto, hold out your hand and gather chakra in your palm."
"Like this?" Naruto did as instructed, forming a small sphere of chakra.
Jiraiya handed him a water balloon. "Now, make this water balloon burst."
"Got it!" Naruto's determination surged. Rasengan, here I come!
Naruto focused his chakra, spinning the water inside the balloon.
The spinning water caused the balloon to deform, slowly flattening.
Next, Naruto attempted the second stage: making the chakra rotate in different directions.
And then, he hit a wall.
It felt like trying to turn your head left while simultaneously rolling your eyes right—a feat incomprehensible to any normal human being.
Time passed, but Naruto remained stuck. The excessive flow of chakra through his meridians brought a sharp tingling sensation.
Looking down at his hands, which were slowly recovering from the strain, Naruto thought wistfully about stealing Sasuke's Sharingan just to copy the Rasengan and return it later.
The Sharingan made learning techniques so easy. Here he was struggling, while Sasuke had mastered Chidori after barely glancing at it.
"What are you thinking about?" Jiraiya asked. He hadn't left, wanting to see how talented this kid truly was.
"Sasuke…" Naruto blurted out without thinking.
"Uh…" Jiraiya choked. I thought you were brainstorming solutions, not fantasizing about another guy?
You think about Sasuke while bathing, and now while training too?
Jiraiya began to regret teaching Naruto the Rasengan. Would this legacy end here?
Unaware of Jiraiya's thoughts, Naruto focused solely on creating some kind of sphere—any sphere. Even a fishball would do.
After his hands recovered, Naruto resumed practice.
At the same time, Naruto pondered alternative solutions. Using the Sharingan to learn the Rasengan seemed hopeless now.
If ninja methods failed, physics would prevail.
Though the coffins of physics experts in this world opened and closed like flip phones, as long as the coffins existed, so did physics.
Naruto recalled the online analysis of the Rasengan's mechanics.
Step One: Break the water balloon using Rutherford's atomic model—similar to a planetary system.
Though he didn't fully understand, trying wouldn't hurt.
With the backing of one world-renowned physicist, Naruto felt empowered. This was what it meant to stand on the shoulders of giants.
By evening, Naruto practiced atop the First Hokage's head, serenading Konoha with music.
After exhausting his energy, he jumped onto the Fourth Hokage's head to train further.
If the Third Hokage had issues with this, Naruto didn't care. Jiraiya said the Rasengan was invented by the Fourth, so why not train directly on his head, absorbing the wisdom of those who came before? What was wrong with that?
Pervy Sage, you can carry this burden for now.
Don't worry, I won't leave you hanging. I'll take responsibility for your future student with the Rinnegan—and I'll handle Konan too. Rest easy knowing you're destined to become a legendary figure.
At this moment, Naruto stood not only on the shoulders of giants but also on their heads.
With the combined blessings of two worlds' mysterious forces, Naruto finally burst the water balloon just before going to bed. Water splashed onto the Fourth Hokage's face.
Naruto didn't care. It wasn't urine. And even if it were, what harm could a son do by peeing on his father's face?
Early the next morning, Naruto presented a water balloon to Jiraiya, channeling chakra into it.
Bam!
The balloon burst.
"How's that?"
Jiraiya was speechless. I know you're talented, but do you have to train so ostentatiously?
The Third Hokage had messaged me again yesterday, asking what I told you. You're putting me in an awkward spot, you know?
I tell you the Rasengan was invented by the Fourth, and you go practice on his head. If I said it was passed down by the Sage of Six Paths, would you climb onto his grave to train?
Speaking of which, does the Sage even have a grave? Can I, the Toad Sage, be buried there?
Regardless, Jiraiya handed Naruto a rubber ball. "Next step: the rubber ball. Keep practicing."
Then he left to entertain himself.
This was the second step of the Rasengan. Completing it meant mastering most of the technique. All that remained was maintaining stability.
The rubber ball was far more challenging than the water balloon. Naruto found that the water balloon method didn't work, so he returned to the expert analysis.
Step Two: Bohr's atomic model.
Unlike the planetary model, this one depicted a standard atom with electron energy levels. Electrons at specific energy levels could only orbit in fixed paths.
First, use chakra to create a core, pretending it's the nucleus.
Then, circulate chakra around it, simulating electrons.
Back atop the Fourth Hokage's head, Naruto soaked in the blessings of two worlds' great minds.
Three days later, Naruto burst the rubber ball.
When he demonstrated it to Jiraiya once more, the latter was stunned. Is this kid really this talented, or does the Fourth Hokage's statue secretly amplify abilities? How is he learning so quickly? I didn't progress this fast when I learned it.
"Cough, cough… Naruto, you've completed the first two steps. The final step is to combine them and maintain rotation. Power, stability, and rotation—these are the three key elements of the Rasengan. Got it?"
"Got it."
Naruto silently thanked his chuunibyou days for obsessively studying the Rasengan and was grateful he hadn't forgotten everything he'd learned.
Step Three: Pauli's Exclusion Principle. No two electrons in an atom can share identical quantum states—orbital layers, sublayers, spatial orientations, and spins.
In the Rasengan, chakra replaced both the nucleus and electrons.
After three more days of practice, Naruto had officially stepped into the realm of the Rasengan. He could feel that the next time he unleashed it, it would undoubtedly be a proper Rasengan—and with one hand, no less.
Approaching Jiraiya, who was relaxing in the bath after lunch, Naruto extended his hand. "Pervy Sage, look!"
Chakra flowed, and a blue Rasengan materialized above Naruto's palm.
Under the sunlight, Jiraiya looked at Naruto's blue eyes and the glowing blue Rasengan. Just as he was about to smile proudly, the Rasengan in Naruto's hand began wildly shifting colors.
"What in the world is THAT thing?!!!"