Once Upon a Time, There Was an Uchiha

Uchiha Rihka, who had just awakened the Sharingan with one magatama, discovered that options to traverse worlds appeared in his eyes. Therefore, in Konoha, he was humble and amicable, living harmoniously with everyone, and was the successor to the Will of Fire. But in other worlds, he was ruthless, punching the boss team in the face, and kicking the protagonist's hero group in the feet.