Life gets pretty boring when you can beat the snot out of any villain with just one punch.

Nothing about Saitama passes the eyeball test when it comes to superheroes, from his lifeless expression to his bald head to his unimpressive physique. However, this average-looking guy has a not-so-average problem-he just can't seem to find an opponent strong enough to take on!

Psychos and Tornado's psychic battle rages on! With Genos's help, Tornado succeeds in rescuing the scattered heroes from their fight against the monsters, allowing her to unleash a devastating attack that warps the city. Although the outlook appears grim, a group of S-class heroes finds the inspiration to turn the tide of battle!