Naruto: I Am Konoha's Renowned Teacher!

After transmigrating to the world of Hokage, he became a background Chunin. He thought he would have to live cautiously and quietly under Naruto and Sasuke’s thumbs for the rest of his life. But then he got the Master Teacher System. As long as he taught disciples, he could receive cultivation feedback and obtain secret manuals and incredible talents from the Myriad Worlds. Training chakra? Using ninjutsu? The times have changed, old man! Take this Thunder Bagua! Spirit Pressure! Star River Supernova! Kamehameha!