"Cover" (被り物, Kaburimono) is the 50th chapter of the One-Punch Man manga series.
At the Entertainment District, Zeimeet is seen walking down the street with two ladies, trying to promote the Hero Association. He asks for a kiss from the ladies when suddenly Garou appears and punches Zeimeet.
Garou, however, felt dissatisfied from beating up Zeimeet. Saitama then appears behind Garou, leading him to the conclusion that a hero has decided to hunt him. He strikes Saitama near the shoulder, angering Saitama who retaliates by using the same move on Garou, thus knocking Garou out. As it turns out, Saitama was actually looking for a wig and not the hero hunter.
The next day, Garou wakes up on a pile of garbage with a fuzzy memory. Back at Saitama's home, Saitama tries out the new wig. Genos finds out about this and calls Dr. Kuseno immediately asking to give Saitama hair transplants.
Saitama was actually going to use the wig as a disguise for the martial arts tournament he was going to attend and invites Genos to come along.