Kyouhaku: Owaranai Ashita
English name: The Blackmail: Tomorrow Never Ends
Genres: Hentai
Type: OVA, Episodes: 3
Aired: Jan 14, 2000 to Jun 23, 2000
Studio: Production D.M.H
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
Yumiko is a school girl wanting revenge for her best friend recording her being gang-raped. So now she aims to rape every single friend her former best friend ever had.

(Source: ANN)