Saitama, an unusual hero who does special training for three years to be unbeatable. He can now destroy enemies with just one punch and a clear victory. Saitama works at the Hero Association along with his loyal fellow Genos.
Things take a turn when monsters of the Monster Association kidnap the kid of the Hero Association’s leader. Top S-class heroes decide to attack monsters to release captives. Meanwhile, Garou, a human association, is also captured and wakes up in a monster’s space.
