One Punch Man: A Hero Nobody Knows is an action fighting game set in a world where threats are commonplace and heroes are the only hope. Saitama, the main character of the game, is a hero who can defeat even the strongest enemy with just a single punch, which bothers him greatly. The game features 3-on-3 battles, allowing players to form powerful teams made up of many familiar faces. The first known playable characters include Genos, Hellish Blizzard, Mumen Rider, Speed-o'-Sound Sonic, and Saitama.