"Again!"
Umino Yoru channeled another surge of chakra into the solid rubber ball, forcing it to spin rapidly.
As more chakra poured in, the ball expanded—compressing and recompressing until it reached its limit.
"Hah!"
With a sharp exhale—
BANG!
The rubber ball exploded violently, torn apart by the spiraling chakra within.
"Still not smooth enough."
Though pleased with the result, Umino Yoru shook his head.
The explosion had been forced, not effortless. Despite his exceptional chakra control, precisely manipulating such dense, high-speed chakra was proving difficult.
He pulled out another rubber ball and repeated the process.
Only after destroying dozens of them did he finally stop.
"Now, time for the final stage—bare-handed Rasengan!"
Emptying his palm, he focused on forming the Spiral Orb without any tools.
Zzzzt—!
A goose egg-sized Rasengan materialized in his hand—
But after just two seconds, it dispersed into nothingness.
"Tch… Maintaining it will take at least another week or two."
He had assumed his chakra control would let him master it faster than Naruto's two-week struggle.
Yet, this final stage was several times harder than the previous three.
The sheer volume and speed of the chakra made fine control nearly impossible. While his superior chakra manipulation helped, it wasn't the deciding factor.
The real key was muscle memory—an almost instinctive feel for the balance between rotation speed and chakra stability.
Only through relentless trial and error could one find that perfect equilibrium.
"Hmm…"
Umino Yoru stroked his chin, deep in thought.
Then, an idea struck him.
"Why follow the steps in order? Why not achieve the final result first… and work backwards?"
Seizing this inspiration, he acted immediately.
"Shadow Clone Technique!"
A clone appeared, already understanding the plan.
Zzzzt—!
Working together, they formed a stable, goose egg-sized Rasengan in his palm.
"Success!"
Though not a one-handed Rasengan yet, this was still a major breakthrough.
After all, this was an A-rank ninjutsu—one of the most powerful single-target attacks in existence.
"Now, the final step."
His expression turned serious.
He had to master the one-handed version. In real combat, relying on a clone would be impractical—he wasn't Naruto, with his bottomless chakra reserves and army of shadow clones.
Closing his eyes, he reverse-engineered the Rasengan's rotation pattern, while his clone used Ultrasonic Radar to analyze every detail.
Minutes passed.
Only when his chakra was nearly depleted did the Rasengan finally fade.
"Hah…"
Exhaling deeply, he grabbed a small bottle of highland honey and activated Gluttony Technique to recover.
At the same time, he dispelled the clone, absorbing its experience and memories.
"So that's how it works."
A confident smile spread across his face.
Once his chakra was fully restored, he attempted the one-handed Rasengan again—this time, trusting his instincts.
Zzzzt—!
A perfect Spiral Orb formed in his palm.
"I did it!"
Umino Yoru 's eyes gleamed with triumph.
What he thought would take two weeks—like Naruto—had been mastered in less than a day.
And it was the one-handed version.
His success wasn't just due to chakra control—it was that brilliant reverse-engineering idea.
Without it, he might have needed another ten days.
(Of course, the fact that his Rasengan was smaller also helped.)
"Now, let's test its power."
He thrust the Rasengan into a nearby tree.
SHHHK—!
Like a hot knife through butter, the trunk split apart, leaving a clean, spiraling gouge.
"Tch… Incredible destructive force."
This was the might of an A-rank ninjutsu.
"Again!"
This time, he slammed it into a riverside boulder.
BOOM!
The rock shattered, its center reduced to a crater of spiral fractures.
"Huh?"
His eyes narrowed.
The damage wasn't just on the surface—the Rasengan's force had penetrated deep, cracking the boulder from within, like the Seven Injuries Fist.
"Further refinement can make it even stronger."
Having mastered the basic Rasengan, he now focused on scaling its size for different combat scenarios—avoiding unnecessary chakra waste.
As for the Great Ball Rasengan, his current reserves weren't sufficient. But a Naruto-sized Rasengan was within reach.
And so, Umino Yoru continued grinding.
When training grew tedious, he used the Rasengan to shred fish jerky into meat floss—creating a delicious, easily digestible snack.
Not only did it taste better, but it also aided nutrient absorption.
Even if he didn't eat it all, selling it could quadruple his profits.
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