Hatake Sakumo's slash relied on chakra flow.
Put simply, it was similar in principle to Chidori Flow—chakra was attached to the blade, and when combined with the unrivaled Hatake-style kenjutsu.
(Hatake swordsmanship), it became nearly indestructible.
Yuya's Shock Release chakra was also a form of power.
Though it had no physical substance, it could still be cut apart by chakra flow.
Yuya was even certain that Sakumo could cleave through A-rank ninjutsu with a single strike.
Techniques that used chakra flow demanded extreme chakra control—even more demanding than Monstrous Strength.
Not only that, the chakra itself needed nature transformation and exceptionally high quality.
Shinobi below the jōnin level were practically unqualified to train such techniques.
Yuya couldn't do it either.
Although he could channel chakra into a kunai, the result was nowhere near true chakra flow.
Yuya was now contemplating a key issue.
Shock Release chakra was a wide-area attack, capable of both offense and defense.
But precisely because of that—
Its single-target penetration wasn't absolute.
If Yuya were to face Naruto using the Rasengan, or Sasuke using Chidori, there was a real chance he would be at a disadvantage.
Using a point to break a surface—
If Yuya's shock-force couldn't overpower Rasengan or Chidori directly, then he couldn't freely clash head-on.
He'd be forced into pure taijutsu exchanges instead.
Ironically, that would limit his own strengths.
The question Yuya pondered was this:
Could he break free from the rigidity of shock-force chakra—
And turn it into something more like a true ninjutsu?
For now, he saw no solution.
So he shifted his thinking.
What if I condense Shock Release chakra into a single point?
If he could compress a wide-area shock-force into one focused point—
Yuya was certain its power would surpass Rasengan or Chidori.
Thinking was pointless without action.
Yuya immediately began experimenting.
He didn't even go far—just a nearby forest on the outskirts of Konoha.
Condensing Shock Release chakra was extremely dangerous.
So Yuya didn't use his fists.
Instead, he used a kunai.
Shock Release chakra gathered onto the blade.
Hummm!!
A faint, pale-white halo appeared around the tip of the kunai—
That was shock-force chakra.
Condensed but unreleased, it radiated an ominous pressure.
Yuya shook his head.
"This won't work. Swinging a kunai like this isn't any different from throwing a punch."
"It still spreads across a surface—it doesn't converge into a line."
Murmuring to himself, Yuya tightened his grip.
HUMMMM!!!
The pale-white halo suddenly brightened.
Under Yuya's control, it began to compress inward.
His idea was simple:
If I compress shock-force, can I force its power into a single point?
But before the halo could shrink even halfway—
Yuya's expression changed drastically.
Without hesitation, he hurled the kunai away.
Shing!!
The kunai slammed into a tree—
And the shock-force detonated.
BOOOOM!!!
A tree as thick as a bowl was blasted clean through the center, wood splinters flying everywhere.
Yuya's palm went numb.
Even though he'd thrown the kunai at the last moment, the backlash from the unstable shock-force still rattled his arm painfully.
"So difficult…"
He didn't focus on the explosion's power.
Instead, he stared at the kunai.
What shocked him was this—
The steel kunai was twisted and warped.
Even hardened steel couldn't withstand compressed shock-force.
Which meant—
This technique was impossible to perform bare-handed.
Shock Release chakra was violent and tearing by nature.
Trying to compress it directly was absurdly difficult.
Unless—
It was given an outer shell.
"An outer shell?!"
A spark of inspiration flashed through Yuya's mind.
In the original history, Naruto's Rasengan was practically a universal technique.
Almost any attribute could be added to it.
Adding Wind Release to create Rasenshuriken was understandable—
But later, even Tailed Beast chakra could be integrated, producing countless variations.
"Rasengan itself is pure chakra shape transformation."
"In theory, any nature transformation could be added afterward."
"And it's extremely stable."
"More importantly… it doesn't require hand seals."
"It actually suits me very well."
After some thought, Yuya decided—
He would learn the Rasengan.
Even if he couldn't immediately combine it with shock-force chakra—
Rasengan alone was an A-rank ninjutsu, already worth learning at his current stage.
At this point in time, Rasengan didn't exist yet in the ninja world.
Even Minato Namikaze had spent three years developing it.
But Yuya was different.
He knew the shortcut.
The training method.
The stages.
The key points.
All of them.
And while Yuya lacked large chakra reserves—
His chakra control was excellent.
Rasengan Training
First stage:
Gathering chakra in the palm.
For Yuya, who had mastered Monstrous Strength, this step was effortless.
He practically skipped it.
Second stage:
The balloon exercise.
Water-filled balloons were burst by rotating chakra.
Yuya completed this step with ease as well.
Third stage:
The rubber ball.
Here, Yuya finally encountered difficulty.
Not due to chakra control—
But due to chakra quantity.
His reserves simply weren't large enough.
For an elite chūnin, learning an A-rank ninjutsu was inherently difficult.
In canon—
Naruto succeeded due to overwhelming chakra reserves.
Sasuke succeeded due to the Sharingan and extraordinary talent.
The rubber ball phase slowed Yuya down.
But through persistence—
He broke through.
In truth, once one could destroy the rubber ball with chakra—
A basic Rasengan prototype was already complete.
"Let's see… can I add Shock Release chakra now?"
Yuya stared at the incomplete Rasengan in his palm and muttered.
This experiment was dangerous.
Naturally, Yuya didn't act recklessly.
He had previously commissioned a pair of special gloves from ANBU—
They didn't interfere with chakra flow and protected his hands.
Even then, Yuya only introduced a tiny trace of shock-force chakra—
Gradually increasing it bit by bit.
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