One Punch Man

Saitama became a hero for fun and trained for three years until he could defeat virtually any opponent with a single punch. The problem is that achieving the strength he wanted has drained every fight of excitement, turning city-destroying monsters into little more than another source of boredom. After the cyborg Genos witnesses his power and insists on becoming his disciple, the two join the Hero Association in search of official recognition and real hero work. Saitama soon learns that being the strongest person around does not mean anyone will notice him, even as disasters keep appearing and he continues searching for an opponent who might finally make battle feel thrilling again.