A single man arose to face the evil threatening humankind!
His name was Saitama. He became a hero for fun...
During his three years as a hero, Saitama has defeated numerous monsters and evil organizations, but no one knows about him...That's because he isn't in the Hero Association registry!
Together with Genos, who wants to be his disciple, Saitama decided to take the Hero Association's test...
- Black Sperm makes a cameo in this volume.