Nothing about Saitama's appearance suggests a superhero, from his indifferent expression to his bald head and average body. However, this seemingly ordinary man has an unusual problem - he can't find an opponent strong enough to fight!
Garo, a man who admires monsters, attacks the Hero Association! After defeating the heroes there, he simply leaves. What the hell does this guy want?! Meanwhile, Miss Blizzard, a B-class hero ranked 1, visits Saitama at his apartment. Since he is just a low-class hero, she thinks she can make him one of her servants, but as always, Saitama has other plans!