Hentai hottie Mai is on a secret mission involving brilliant engineer, Kunio Sasaki. With her mission complete and her duty to her employers done, She and hot Sasaki are leaving the hotel when they are captured by a group of men that are all dressed in black.
Mai loses consciousness during the abduction and when she begins to awaken it is to find that she is in an abandoned building and that she is tied up and helpless. Two other girls are also there tied up and naked and Mai is forced to watch the rough sexual acts they are forced to endure.