Teacher Kitano is forced by a corrupt loan shark to kidnap female students to repay his debt. Nana and Yuria, along with female teacher Satomi, are drugged into unconsciousness and captured by Rannda, a sadistic BDSM psychopath, becoming his sacrificial victims. As the fourth installment of the hardcore violent SM series, this film delivers a shocking sequence in which all three women have their nipples repeatedly pierced with needles. An intense, brutal, and disturbing portrayal of torture and suffering unfolds relentlessly.