One-Punch Man (Season 3)

For fun, Saitama turned into a hero. He developed unstoppable power via three years of specialized training, and today he is a hero who can defeat any foe with a single blow (One Punch). Saitama starts official hero activities at the Hero Association alongside Genos, who happened to be his apprentice. When the Monster Association unexpectedly shows up and kidnaps the executives' children, the Hero Association is forced into a crisis. In order to free the hostages, the S-Class Heroes band together and plan to raid the Monster Association's hideout. At the same time, the "human monster" Garou awakens inside the Monster Association's lair.