Fire Punch, by Tatsuki Fujimoto, is a wild and hardcore manga that predates Chainsaw Man, with epic fight scenes and interesting characters. Despite sensitive and disturbing content, Fire Punch is ...

and serialized in Shueisha's Tonari no Young Jump. Crunchyroll streamed both previous seasons of the One-Punch Man anime, officially describing it: "Saitama started out being a hero just for fun.