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: Anime News Network)

Yuuka's 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 afterward, all the band members, except Keith the leader, kidnapped and raped her on the rooftop all as a scheme by Keith who is madly in love with his brother. Now she can't forget nor can she get away. 
Included one-shots: 
Volume 1: Konya dake no Yakusoku, Kanojo

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