Yui, a high school girl is abducted to a lonely Island in the middle of the ocean. Eight childhood friends of her who were raised in the same orphanage are gathered on that island too. Now that she meets them again for the first time in a long time, they've all become first rate criminals!! Moreover, a device makes Yui experience intense arousal at regular intervals, and if they don't make her come she will die. And there are further secrets on that Island: continuous arousal crime suspense!!