One Punch-Man (Manga) Wiki

In this new action comedy, everything about a young man named Saitama screams “average,” from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking fellow doesn’t have your average problem… He’s actually a superhero that’s looking for tough opponents! The problem is, every time he finds a promising candidate, he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!

Source: Viz Media