Toumei Ningen (OVA)
English title: The Invisible Stud
Japanese title: 透明人間
Type: OVA
Episodes: 2
Source: Original
Genres: Hentai
Studios: Y.O.U.C
Producers: Digital Works
Duration: 27 min per ep
Rating: Rx - Hentai

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)