​Sakuramiya Saya and Hinata find themselves in a forbidden love affair as sisters. When their relationship is exposed by Tachikawa, a member of the photography club, he uses their secret against them. Tachikawa takes advantage of Hinata’s vulnerability, blackmailing her into a sexual encounter which leaves her traumatized. Concerned for her sister’s well-being, Saya innocently investigates, only to fall victim to Tachikawa’s dark desires as well. Their lives spiral into a nightmare as they are subjected to repeated acts of rape and abuse by Tachikawa and his companions. Bound by fear, the sisters become prisoners to their tormentors. Will they ever find a way to break free from this cycle of depravity?​