Vaccine Man

The first book introduced the various deeds of Sweet Mask, the Hero Association's current top-ranked A-rank hero, since his debut. The second detailed the rankings, titles, and abilities of all current S-, A-, B-, and C-rank heroes in the Hero Association. By this point, Meikyō had roughly figured out what world this was. One-Punch Man! He just didn't know where in the timeline he was. But since the Hero Association already had S-rank heroes, that meant a certain bald caped demon had already been born.