Life gets pretty boring when you can punch any villain with just one fist.

Nothing about Saitama passes the eye test when it comes to superheroes, from his blank expression to his bald head and unimpressive physique. However, this seemingly ordinary man has one not-so-ordinary problem—he can't find a worthy opponent to face!

Class A heroes are battling against the gigantic monster Multi-Eyed Octopus. Wait, is Class S hero Flashy Flash joining the fight?! Even as the Monster Association continues to ramp up its attacks, its true objective remains a mystery. In the meantime, the martial arts tournament is reaching the semifinals!

This action-packed superhero comedy about a man's decision to be a hero for fun is the hit of 2015 and 2016!