As the world gets thrown into chaos, superheroes are employed to push back the tide of darkness. Operating in City Z, Saitama is not one such hero because he is not part of the Hero Association. After breaking his physical limits through training, Saitama transforms himself to become the world's strongest superhero. His strength and physical prowess are unmatched that he can easily defeat any opponent just with a single punch; hence, the title. This quickly becomes a problem though as battles start getting boring for Saitama since he just keeps on winning.
What does a hero, who fights and protects the people, do then if he is filled with an overwhelming sense of boredom? He becomes a mentor to a cyborg who lives on revenge.
One-Punch Man is an anime series that is based on the webcomic created by ONE and the manga illustrated by Yusuke Murata. Season was produced by Madhouse and the second season was produced by J.C.Staff.