While Kurama was lost in his memories...
Naruto stared at the spinning Rasengan in his hand.
He didn't stop.
Completing the Rasengan was just the first step.
There was more—far more—beyond this technique.
The next moment, the excitement on Naruto's face faded. His gaze sharpened, and his expression turned serious.
Looking at the Rasengan, he began mentally dissecting it, breaking it down into its fundamentals.
Soon—
With his deep understanding of the Rasengan's structure and chakra flow, something clicked in Naruto's mind.
You have fully mastered the Rasengan and gained complete insight into its composition! You've had an epiphany!
You have mastered the Big Ball Rasengan!
You have mastered the Super Big Ball Rasengan!
You have mastered the Planetary Rasengan!
Technique Breakdown:
Big Ball Rasengan: A larger version of the Rasengan, created by infusing it with greater chakra volume and tighter compression. The destructive power far surpasses the original technique.
Ultra Big Ball Rasengan: An advanced variant fueled by tailed beast-level chakra. It's not only larger in size but exponentially more powerful.
Planetary Rasengan: A unique form developed after observing planetary motion. One large Rasengan orbits at the center, surrounded by four smaller Rasengan revolving around it like moons—overwhelmingly destructive.
Thanks to Naruto's remarkable intuition and insight, countless Rasengan variants bloomed in his mind like wildfire.
He quickly mastered multiple Rasengan derivatives:
Big Ball Rasengan,
Ultra Big Ball Rasengan,
and even the Planetary Rasengan!
At that moment, Naruto looked at the Rasengan spinning in his hand. A confident smile tugged at his lips.
"Big Ball Rasengan!"
he suddenly declared.
In response, the massive reserves of Uzumaki chakra within him surged toward his palm.
Kurama, still observing from inside the seal, blinked.
The Rasengan in Naruto's hand was growing—rapidly—before his very eyes.
Oi oi oi...
What the hell is this kid doing?!
Sure, Kurama had seen the Rasengan before—from the Fourth Hokage himself.
But this...
This was different.
The Fourth's Rasengan never grew like that on its own!
Kurama watched, wide-eyed and speechless, as Naruto continued pouring chakra into the technique.
Before long, Naruto was holding a Rasengan nearly four to five meters in diameter—and his chakra was still surging.
Thanks to Naruto's enhanced physical strength and mental fortitude—both far beyond his original self—even a standard Big Ball Rasengan had become more powerful in his hands.
But Naruto wasn't done.
No, not even close.
His smile widened into one of pure excitement.
"Ultra Big Ball Rasengan!!!"
he shouted.
The Rasengan in his palm suddenly emitted a deep, resonant roar.
Its size ballooned rapidly—expanding, compressing, vibrating with unimaginable power.
Until finally...
It grew so large, it rivaled the sheer mass of the Nine-Tails himself.
A colossal vortex of chakra, spiraling at extreme speed with Naruto at the center.
The air howled. Naruto's clothes flapped wildly. Even the fur of Kurama, imprisoned in his cage, trembled under the generated wind pressure.
But what shook Kurama the most...
...was the sight before him.
In the dim, sealed space inside Naruto—
A boy stood holding a Rasengan so massive, it looked like he had summoned a blue sun into existence.
The amount of chakra compressed into that spinning sphere...
Even Kurama—he, who possessed near-limitless chakra as a tailed beast—was left speechless.
"Tch... this brat..."
Kurama muttered in disbelief.
Before this, when Naruto had started his training...
He never imagined that a jutsu—a single technique—could reach such terrifying heights.
But even more shocking...
Kurama himself didn't know many flashy or elaborate jutsu.
Yet even he understood how difficult it was to create new techniques, let alone ones of this magnitude.
And now, this kid—
This tiny human, not even the size of one of Kurama's claws—
Had taken the Fourth Hokage's technique,
And with ease...
Created something that even stunned a tailed beast!
At that moment, Naruto looked up at the swirling sky inside his mindscape and saw a Rasengan—massive beyond anything he had ever imagined.
He turned his gaze toward the Nine-Tails behind the bars of the seal.
"Yo."
"Kurama."
"You wanna see the power of this move?"
Naruto could feel it.
The Rasengan hovering above him now—
It was colossal. Tremendous. So massive it could level a village in the blink of an eye.
Its size alone rivaled that of the great Nine-Tails himself.
And under Naruto's precise chakra control,
The chakra inside this titanic Rasengan was compressed tighter than anything he'd ever attempted before.
Flattening a village?
Child's play for a Rasengan like this.
Kurama's ears twitched.
Tch.
"If you're trying to kill me, just say it outright. I'll go down swinging."
"But don't you dare use me for target practice, brat!"
"You little punk—have some damn decency!"
Naruto burst into laughter at the rare look of panic on Kurama's face.
He hadn't seen the fox that rattled in a long time.
Of course—he didn't actually intend to harm Kurama.
But he wasn't done yet.
Still holding the gigantic Rasengan in one hand, Naruto extended his free hand—and began forming another Rasengan.
Once he completed the Big Ball Rasengan,
He shaped a second.
Then a third.
Then a fourth.
Each orb began to rotate slowly around the central, massive Rasengan like moons orbiting a planet.
Only after all four were spinning in perfect synchronization did Naruto stop.
"Phoenix Rasengan!"
He gazed up at the cluster of Rasengan with eyes shining in awe.
It looked like a small solar system of raw chakra—majestic, deadly, and absolutely mesmerizing.
Even Kurama, observing from behind the bars of the seal, felt a sudden chill.
That formation...
That pattern...
It radiated danger.
What the hell?!
Is this kid really just a brat?!
Kurama's fur practically stood on end.
Where did this little Jinchūriki even come up with these ideas?!
With the Phoenix Rasengan fully formed,
Naruto suddenly noticed something unusual.
The high-speed rotation of the Rasengan orbs was creating suction—
Pulling droplets of water from the surface of the mindscape's ground into the air, spiraling them around the massive chakra construct.
A breathtaking scene unfolded before his eyes.
Naruto was stunned.
The Rasengan's rotation was generating real gravitational pull.
In a real fight, even if the enemy managed to avoid a direct hit,
The Phoenix Rasengan's gravitational force could still draw them in—
—making escape nearly impossible.
Naruto hadn't expected this.
But now?
Now he was eager to see its full power.
With zero hesitation, Naruto hurled the Phoenix Rasengan downward—
Straight into the floor of the sealed space.
BOOM!
It was like Mars crashing into Earth.
An immense explosion ripped through the dimension, shaking everything to its core.
The ground cracked.
The air itself seemed to rupture.
The shockwave exploded outward in a dome of pure force.
Naruto was slammed backward, pressing him hard against the bars of Kurama's cage.
Even Kurama had to brace himself, digging his claws deep into the ground just to stay upright.
Inside those massive, slit-pupiled eyes—
—for a fleeting moment—
—a flicker of genuine fear appeared.
This kid's power…
It's insane.
But while Kurama tensed, Naruto stood tall—arms spread wide—welcoming the shockwave like an old friend.
A wild, joyful grin lit up his face.
This was his strength now.
This was the result of his relentless training.
And in that moment,
Naruto Uzumaki had no doubt.
His Phoenix Rasengan was a force to be reckoned with.
...
TN:
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