After deep thought…
Tobirama made a decision.
He'd teach his proudest technique…
Flying Thunder God!
To Kazuku!
Firstly, Kazuku was a prodigy, mastering monstrous strength, Eight Gates, Water Release, Shadow Clone, and Wood Release in months.
He even developed the fearsome Rasengan!
Since seeing it, Tobirama studied it whenever he had time.
To his shock…
Rasengan was harder than he imagined.
Even knowing its mechanics, he struggled to learn it.
Only through practice did he realize…
This was a high-difficulty technique even he, the God of Ninjutsu, couldn't easily master!
"Rasengan's training level is at least S-rank…"
This shocked Tobirama yet again.
He knew Kazuku defied norms, but casually creating an S-rank technique…
Shook him to his core.
It redefined his understanding of technique development.
"And Rasengan has room for further development."
Tobirama observed it was a non-elemental technique.
It spun chakra irregularly to form.
No chakra nature was infused.
In other words…
Adding a chakra nature…
Could vastly boost its power!
Possibly more than double!
This discovery thrilled and amazed him.
Reaffirming Kazuku was a genius, a monster.
Of course…
For Tobirama now, forget adding chakra natures…
He hadn't even mastered basic Rasengan!
Yes.
He, the God of Ninjutsu…
Still hadn't learned it!
Not only that…
He had no clue how to learn it!
"Thinking about it…"
Tobirama stood in his office, gasping.
A stunning fact hit him.
Though he hated admitting it, he couldn't deny…
"A seven-year-old casually invented a technique I can't learn?"
"What's in that kid's head?"
In a flash, Tobirama's mindset collapsed!
Who…
Was the God of Ninjutsu?
Tobirama clutched his forehead, freaking out.
Compared to Kazuku, he felt like a failure.
"But, while Rasengan's powerful and seal-less…"
"All techniques have risks and costs."
"Like my Impure World Reincarnation."
"It requires sacrificing lives."
"If the reincarnated learn the seals, they can break free through reverse sealing."
"That could cause chaos."
"But I won't teach it to anyone else."
Initially, Tobirama created it to revive his brother.
Learning its costs and risks, he banned it.
To prevent future misuse against Konoha.
"Using it to revive me and Big Brother to attack Konoha's Hokage…"
"Just thinking about it is terrifying."
"Well…"
"No ninja could pull that off."
"Anyway, every technique has conditions. Rasengan's no exception."
Tobirama muttered.
Despite its strengths…
Its weakness was clear.
"Attack range."
"Rasengan requires the ninja to hold it, needing close contact to hit."
"Though Kazuku has Eight Gates, faster ninja exist."
"But…"
"If Kazuku learns Flying Thunder God, it's different."
To Tobirama, Flying Thunder God and Rasengan were a perfect combo.
Mark the enemy, flash behind them…
One Rasengan.
Imagining it, Tobirama felt the enemy's despair.
On another note…
He was Kazuku's grandfather.
A grandfather should leave something for his grandson.
You don't take techniques to the grave.
Would he bury Flying Thunder God?
He hadn't considered it before because it was a space-time technique.
Incredibly hard to learn.
Even sharp Hiruzen…
Or Sharingan-wielding Kagami…
Couldn't master it.
But…
Kazuku was different!
He was a genius.
A monster!
He could learn it.
"And Kazuku's biggest advantage is youth."
"He can train for years."
"One, two, five, ten years."
"Even if it takes a decade to master…"
"That's enough."
Crucially…
Flying Thunder God was one of Tobirama's few presentable techniques.
Though the God of Ninjutsu, most of his techniques were banned.
Not ideal to teach Kazuku.
"But…"
"Flying Thunder God's S-rank. Kazuku might not master it."
Tobirama took a deep breath, resolved.
He glanced at the wall clock.
"Hm, time to clock out."
Confirming it was time, he left the office.
Though he led Konoha, overtime…
Was a no-go.
It wasn't wartime.
In peace, what work required overtime?
If a Hokage in peacetime worked tirelessly, no time to rest…
"No…"
Tobirama shook his head, scoffing. "No Hokage could be that foolish."
Meanwhile…
Kazuku leaned back, lying on the tatami.
After battling Tsunade…
He successfully swindled…
No, fairly won all her bill stacks!
"Hm?"
Kazuku glanced at Tsunade, pouting, holding back tears.
Awww.
Tsunade's so cute.
[Check-in system cooldown ended!]
A familiar voice rang in his mind.
(End of Chapter)