Wearing a black suit, "Nakagawa Marin" is left abandoned in a room with her mouth gagged and her body restrained. She tries to call for help using the phone in the room, but no one answers. During her struggle, a man appears and subdues the frantic Marin by knocking her out with chloroform. When she regains consciousness, she finds herself tied to a chair, completely immobilized and under full-body restraint.