Natsuki traveled through Hokage and obtained the automatic full-level Ninjutsu system. No matter what Ninjutsu, he can learn it instantly, and he can also evolve these Ninjutsu by analogy.
Ever since, Natsuki became awesome.
Uchiha Gakutomi: "You can open Susanoo without Sharingan. How did you do it?"
Jiraiya: "I want to be quiet, don't bother me, and show off."
The leader of the mountain clan said: "The heart-to-heart technique is also a secret skill of our clan. Can you give me some face?"
Orochimaru: "That brat named Natsuki asked you to imitate me, but I didn't let you surpass me."
The Hokage's office was overcrowded by the big guys.
"Hokage-sama, we can't teach this child."
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.