Ienai Koto The Animation
English title: Price Of A Secret
Japanese title: イエナイコト THE ANIMATION
Type: OVA
Source: Manga
Episodes: 2
Status: Finished Airing
Aired: Mar 6, 2015 to Mar 4, 2016
Duration: 15 min per ep
Rating: Rx - Hentai
Studios: Peak Hunt
Producers: MS Pictures, BOOTLEG
Genres: Hentai

Hayakawa Rena as school advisor caught her sister, Hayakawa Mina having sex with guy teacher. But Rena is blackmailed into being a plaything for men.

(Source: AniDB)