Hiding her identity as an investigator, Nishikawa Chihiro infiltrated the dark organization RDD as a female torturer, SISTER A. After obtaining crucial information from the organization, she attempts to escape and make contact with her superior... But now, the tortures she has witnessed countless times are inflicted upon her own body. Her body is made hypersensitive through drug administration. Not only her vagina but also her anus becomes a target. Can she endure this hell of orgasms that make her eyes roll back?
