Hitoriga The Animation
Japanese title: 独蛾 THE ANIMATION
Alternative titles: Hitoriga Counseling
Type: OVA
Source: Manga
Episodes: 4
Status: Finished Airing
Aired: Jun 26, 2009 to Sep 22, 2010
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Office Take Off, Cafe de Jeilhouse
Producers: Pink Pineapple
Genres: Hentai

On the train to school one day, Shirakawa Sumire is molested. However, when she confides in teacher Takahashi, the nightmare escalates...

(Source: AniDB)