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!

Meanwhile, Class-S hero King is known as the strongest man on earth. Even monsters fear him. But when a mysterious organization sends an assassin after him, the shocking truth about King is revealed!