Recording the ninjutsu in the Book of Seals had no effect on him whatsoever.
After all, if someone wanted to learn this ninjutsu, the first thing they had to consider was whether they could run fast enough.
If they could not run fast enough, it could only be considered a move for mutual destruction.
And the most crucial point was that if anyone else wanted to unleash a Super Uzuhiko Rasengan with the same level of power as his, they first had to see whether they possessed that much chakra.
Even in its normal state, the Super Uzuhiko Rasengan drained a tenth of his chakra. An ordinary ninja would turn into a dried husk after using it once.
Even an elite jonin could probably only use it once, and only at the cost of complete exhaustion.
Watching Yuki Yuichi record the Super Uzuhiko Rasengan in the Book of Seals, Sarutobi Hiruzen smiled.
It had been a long time since he had seen a young man with such talent and such an absolute Will of Fire.
He believed that as long as Yuki Yuichi was around, Konoha's ninjutsu arsenal would grow considerably.
Though he suspected that most of them would be forbidden techniques, just like the ninjutsu developed by his teacher.
But that was still a good thing.
The Flying Thunder God was also a forbidden technique, yet Minato Namikaze, who had mastered it, was currently one of the foremost powers in the Shinobi World.
Although he had yet to make a name for himself, the other villages knew of his existence to some extent.
Uzumaki Kushina looked at the name of the ninjutsu Yuki Yuichi had written in the Book of Seals, unable to suppress the joy in her heart.
Super Uzuhiko Rasengan.
The name alone showed that Yuki Yuichi