Under the promise that he would delete the porn video of her sister, Mizuki has been used and abused at Tanabe’s will for two days. Despite the pill they gave her, supposedly a contraceptive, making her act strangely, Mizuki continued to accept Tanabe. One day, while being taken outside, Mizuki encounters a scene where several female students from her school are having an orgy with numerous men. To her horror, among them is her beloved sister, Aika…