One-Punch Man

Saitama trained so hard for so long that his body broke through every limit anyone thought existed. The result: no opponent in the world can survive more than a single punch from him. The price he didn't see coming is boredom. The fights that used to thrill him end in seconds, leaving him to drift through grocery sales and apartment chores in a daze of low-grade depression. Then a cyborg teenager named Genos shows up demanding to be taken on as Saitama's disciple, dragging him by accident into the chaos of the Hero Association and the world of pros it represents.