Toumei Ningen (OVA)
English name: The Invisible Stud
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Feb 10, 2006 to May 12, 2006
Studio: Y.O.U.C
Source: Original
Rating: Rx - Hentai
Synopsis:
Mie happened to pick up medicine that an old man dropped. When he took the medicine, his figure disappeared. Soon he went to a public bath to peep, and began to molest. Then, he went to an all-girls school.

(Source: AnimeNfo)