Naruto: I Am Konoha's Renowned Teacher!

He transmigrates into the world of the Hokage, becoming an extra chunin. He thinks he'll have to live cautiously and quietly under Naruto and Sasuke's noses for the rest of his life.

But then he gets the Master Teacher System.

As long as he teaches disciples, he can receive cultivation feedback and obtain secret cultivation manuals and amazing talents from the Myriad Worlds.

Cultivate chakra? Use ninjutsu?

The times have changed, folks!

Taste my Thunderclap Octopus! Spiritual pressure! Galaxy Starburst! Kamehameha!