Zero Sum Game: Sex Crime
English name: Zero Sum Game
Genres: Hentai
Type: OVA, Episodes: 1
Aired: Oct 25, 2001
Source: Manga
Rating: Rx - Hentai
Synopsis:
Yuuka's boyfriend/husband has a brother in the band "Zero Sum" as the lead singer. After a request, she and her husband Yazaki got tickets to go backstage at a concert. However afterwards, all the band members, except Keith the leader, kidnapped her and raped her on the roof top all as a scheme by Keith who is madly in love with his brother. Now she can't forget nor can she get away.

(Source: ANN)