Naruto: The Life Changer - Chapter 97 -:

In an era when knowledge was banned, the physician Lyle had to be extremely cautious even in academic research, an invitation from the Andrei Academy materialized before his eyes.The Andrei Academy of Cassandale?Lyle peered closely at the tombstone before him, hissing,“Ah, the scholars here really know how to pick a spot.”

“Why is it that everyone has hated you since you were little?”“Why do you always manage to explode with power when you’re in dire straits?”“Why, despite having no weak chakra control, can’t you even walk on water?”Kurama (Nine-Tails) looked up and laughed heartily: “There’s only one answer—”“You are! The one who nearly destroyed Konoha and killed the Fourth Hokage twelve years ago! The Jinchuriki of the strongest tailed beast, the Nine-Tails Kurama! Hahahahahaha!”

The system: We must take the plot seriously!

Mo Fan: Ok.

The system: We cannot be OOC!

Mo Fan: Yes.

The system: We have to be cold. We must be ruthless. We cannot lose ourselves in this imaginary world.

Mo Fan: …no problem.

Not long after…

Mo Fan: System, can we talk? Hold my gong and take him away.

System: ……

- Description from Novelupdates

Kanda Kyoichi transmigrated to Konoha and became a temporary instructor at the Ninja Academy. Fortunately, he awakened the Mentor System.By teaching others, he could earn rewards.Thus began Kyoichi’s career as a “teacher” in the ninja world.Shisui: “Sensei’s unique interpretation of the Will of Fire has given the Uchiha Clan a true sense of direction!”Asuma: “The essence of the jade lies in protecting the people, with the advanced leading the way for the less experienced. Only then can Konoha become stronger!”Kakashi: “He’s my life mentor. He transformed Konoha!”...Years later, in the memoirs of Kyoichi, now the Hokage, he wrote:“I honestly just wanted to be a life mentor!”