Naruto: I Can Upgrade My Techniques Infinitely
Chapter 138: Concept-Level!

Chapter 138: Concept-Level!

"This mission must’ve been tough on you. Please make sure to stop by the Yamanaka Clan later to receive your reward," Tanuki said as they returned to Konoha, finally removing his mask.

Sure enough, he was a member of the Yamanaka Clan. Kazuki didn’t recognize him specifically, but knowing he was Yamanaka Mai’s father was enough.

"You’re too kind, Yamanaka-san. We were just doing our duty," Kazuki replied politely with a smile. He might be friendly with Mai, but proper respect was still due to her elders.

Yamanaka-san expressed his thanks a few more times, then took Mai with him and left. Kazuki and Kakashi exchanged looks—the mission had been dangerous, but ultimately successful.

The only real wildcard was Konan. But clearly, none of the others had recognized her true identity. Even Uchiha Shisui, who had been standing right next to Kazuki, remained unaware.

Kazuki shot a glance at Shisui.

Come to think of it, ever since they left the Land of Rain, Shisui had been unusually quiet.

Wait—could he have... fallen for Konan?

Kazuki instinctively dismissed the idea. That was Konan, the Angel of Akatsuki, and the most committed user of nail polish in the organization. Kazuki even suspected she was the one providing all the Akatsuki members with matching manicures.

Truly the number one nail artist of the ninja world.

Still, when he thought about it more... maybe not so impossible. Konan was objectively beautiful—especially that side profile from earlier, which had a breathtaking, ethereal quality. For someone like Shisui, new to romance, getting caught off guard was understandable.

"Ahem... White Crow, what’re you thinking about?" Kazuki asked with a sideways glance.

Kakashi, who’d been walking away, paused. He, too, was curious.

"I was thinking... about that girl..." Shisui, even with his mask on, was visibly smiling like a love-struck fool.

Kazuki’s eye twitched. Kakashi raised an eyebrow—was White Crow actually a romantic?

Kakashi couldn’t help but think of Obito. Obito had been head over heels for Rin, completely devoted. Kakashi had seen it clearly.

That thought darkened Kakashi’s gaze.

He remembered that day—when Rin ran into his Chidori.

Kakashi had never really had feelings for Rin. He knew how deeply Obito cared about her. And with his parents dead, Kakashi had long stopped caring about love or romance.

But after Obito’s "death," things changed. Not affection—but responsibility.

Obito had loved Rin. He had entrusted Kakashi with his Sharingan. So Kakashi had wanted to protect Rin on Obito’s behalf. To carry his friend’s hope. To honor that trust.

And Rin had died by his hand.

"Girl?" Kazuki raised an eyebrow. He had guessed, but still wanted confirmation—better to ask now than let some dumb misunderstanding fester.

Kazuki hated those cliché melodramatic tropes where a single unasked question spiraled into endless tragedy. Just because this was the Naruto world didn’t mean it was exempt from bad writing.

He wasn’t letting that happen to him.

"Ah, I just wanted to know what color her nail polish was. I want to get a similar one for my aunt," Shisui said with a sheepish laugh, scratching his head.

Kazuki and Kakashi rolled their eyes in unison and walked off.

Once they reported in and wrapped the mission, Kazuki was granted a three-day leave. He planned to use it to continue refining his jutsu—specifically, the Rasengan. He was close to an upgrade, and he wanted to see what kind of evolution it would trigger.

So for the next three days, Kazuki did nothing but spin chakra into spheres. So much Rasengan practice, he started compiling insights into how chakra quantity affected elasticity, texture, and tactile feedback.

"I could probably write a thesis titled ’The Variation of Rasengan Elasticity and Tactile Feedback in Relation to Chakra Injection Models’," Kazuki muttered as he stared at the glowing orb in his hand.

He was forming Rasengan in his dreams at this point.

He even blew up his bed.

Good news? Rasengan didn’t cause fires. Bad news? It did cause a ton of physical destruction. He had to spend a fortune repairing his room and furniture.

Still... he got the upgrade.

As always, it was a familiar set of three options.

[What Physics Do You Even Follow?: As your understanding of physical principles improves, your Rasengan’s destructive power and attributes increase. No upper limit.]

"Not bad," Kazuki muttered. "But the problem is... my physics knowledge..."

He grimaced.

Beyond remembering the Tyndall effect, he knew jack. If he’d still been in high school—hell, even a liberal arts student version of him—he’d have been okay. That was the peak of his academic life.

But four years of college had nuked his memory. Once he started working, everything went out the window. Typing too much even ruined his handwriting.

Modern cyber-illiteracy in its purest form.

So while the ability sounded amazing, the cost-benefit ratio just wasn’t worth it in his case. Plus, this was the ninja world. How much science did it even have?

Sure, they had electricity and TVs—but tech here was weird. Inconsistent.

So Kazuki skipped that one.

[Rasengan: Secret Technique of the Monkey’s Peach Grab! Your Rasengan will always hit the target’s weak spot.]

"Hooooly—" Kazuki sucked in a sharp breath. "Good lord."

Guaranteed?

That was... a concept-level ability.

It meant that any Rasengan he formed would automatically target the enemy’s most vulnerable—most agonizing—spot.

"Monkey’s Peach Grab" sounded cute, but Kazuki knew exactly what it meant.

This was the kind of move that made every man instinctively cross his legs. A chakra-guided nutcracker. And a conceptual one at that.

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