Sugiura, the head of the secretary department, is ordered to monitor the vice president, who is suspected of insider trading. He selects his subordinate, Eri, as his surveillance partner. For Sugiura, who has long had his eye on Eri under the guise of work, the chance to spend day and night with her becomes a golden opportunity. At the apartment where they are conducting surveillance, he assaults Eri, records the rape, and uses the footage as blackmail to control her completely. Drawn into his sinister plot, Eri's fate grows increasingly perilous.