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

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)

Tokano Yuuka has been going out with her boyfriend Yazaki Norikazu for a little over a year now but doesn&rsquo;t get to see him everyday since he works in a different city as a newspaper writer. Although they are apart, they love each other and things are going well. Norikazu gets an opportunity to interview Saeki Keito, the lead singer of the most popular band in Japan, Zero Sum Game, because they were good friends in high school. Being a fan of the band, Yuuka gets to tag along. However, Yuuka soon finds herself being raped by the members of the band while Keito distracts Norikazu because it seems that Keito has an obsession with him. After the traumatic event, the relationship between the three becomes extremely complicated. 
(Source: MangaHelpers)

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