While I'm in Konoha, My Ninjutsu Actually Improves on Its Own!

Shen Maple, who traveled to the world of Naruto, suddenly awakened to the system of automatically upgrading ninjutsu when he was practicing ninjutsu. Ninjutsu, genjutsu, taijutsu, senjutsu. Not qualified enough? The system comes together! "Ding, you have learned the art of hundreds of heroes and are being automatically upgraded..." Shen Feng: Does this make me stay young forever? "Ding, your ghoul seal is being upgraded on its own." Shen Feng: I don't want something with side effects like this. "Ding, your filthy reincarnation is being upgraded on its own!" Shen Feng: I won't dig up corpses! Nagato: I heard that you know all ninjutsu? Shen Feng shook his head: I only know forbidden arts! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.