Shiranui, the mother of Yukikaze Mizuki, went missing during a mission. She was being broken in to become a slave-prostitute by Kuroi, the King of Succubi. As part of this process, under the supervision of the trainer Leal, she was temporarily deprived of her sight— heightening her sense of smell and physical sensitivity—before being forced onto the stage for a training show. There, she was compelled to engage in depraved sexual acts with the audience, having the humiliation and pleasure of a sex slave deeply imprinted upon her.