Mesu Kyoushi: Injoku no Kyoushitsu
Japanese title: 牝教師 淫辱の教室
Type: OVA
Episodes: 3
Source: Visual novel
Genres: Hentai
Studios: Anime Antenna Iinkai
Producers: Milky Animation Label, MS Pictures
Duration: 27 min per ep
Rating: Rx - Hentai

Based on the adult game by Bishop.

Toudou Miyuki and Sanada Eiji are teachers in the same school and lovers. They had decided that they would preserve their chastity until they are married. However, Miyuki is assaulted and loses her virginity to Takuya, Eiji's step-brother. Furthermore, it doesn't stop there as Takuya turns his attention on the other female teachers one after the other.

(Source: hanime)