Mesu Kyoushi 4: Kegasareta Kyoudan
Japanese title: 牝教師4 ~穢された教壇~
Type: OVA
Episodes: 6
Source: Visual novel
Genres: Hentai
Studios: PoRO
Duration: 21 min per ep
Rating: Rx - Hentai

Based on the erotic game by Bishop.