Stringendo: Angel-tachi no Private Lesson
English title: Stringendo
Japanese title: ストリンジェンド～エンジェルたちのプライベートレッスン～
Type: OVA
Episodes: 12
Source: Manga
Genres: Hentai
Studios: Flavors Soft, Maboroshi Koubou
Producers: Pink Pineapple
Duration: 27 min per ep
Rating: Rx - Hentai

Story about how each popular girls in high school ended up having sex with some of the less popular guys. Each of them have their own temptation for desire and lust which they could not control - that is Sex.

(Source: ANN)