The Invisible Stud / Toumei Ningen

Every boy in childhood wanted to become invisible and sneak to the girls in the locker room. And in this hentai realized the dream of many... the Main character MIA-kun picks up a strange package that fell from the pocket of some old man. Curiosity gave precedence over self-preservation, and he took the pill. What was his amazement when he realized that he became invisible. As for the experiment, and in order to be certain, if he's not delusional, it is sent to the locker room of the local women's bath...