The story of One-Punch Man, a hero that does it just for fun and can defeat his enemies with a single punch.
In a world of superhuman beings, Saitama is a unique hero, he can defeat enemies with a single punch. But being just one hero in a world filled with them, his life is empty and hollow: he gets no respect from anyone, he displays a laidback attitude to everything and for the most part, he finds his overall hero life pointless… and worst of all, he lost his hair due to intense training. These are the adventures of an ordinary yet extraordinary hero.
Follows the life of an average hero who manages to win all of his punches with one punch! This ends up being the cause of a lot of frustration as he no longer feels the thrill and adrenaline of fighting a tough battle. Maybe all of his rigorous training to become strong wasn’t worth it. After all, what’s so good about having an overwhelming power?
Saitama, the protagonist, is an exceptionally powerful hero who easily defeats the monsters or other villains with a single punch. However, due to his overwhelming strength, Saitama has become bored with his powers and is constantly trying to find stronger opponents who can fight him.
Saitama spent most of his life as a normal guy, until one day he chose to become a hero for fun and worked extremely hard to become strong. Now too strong that he can defeat his enemies with a single punch, life again was becoming too dull. However, after meeting the cyborg, Genos (who looks up to Saitama and his immense power) and joining the Hero Association together, life begins to get more interesting.