Toumei Ningen (OVA)
English title: The Invisible Stud
Japanese title: 透明人間
Alternative titles: Tomei Ningen, Invisible Man
Type: OVA
Source: Original
Episodes: 2
Status: Finished Airing
Aired: Feb 10, 2006 to May 12, 2006
Duration: 27 min per ep
Rating: Rx - Hentai
Studios: Y.O.U.C
Producers: Digital Works
Licensors: Critical Mass Video
Genres: 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)