Ayumi, the wife of a department chief, works at the same company. Her beauty and charm gradually spark romantic feelings in her husband's subordinate, Reiko Sawamura. Becoming aware of his growing affection, Reiko grows jealous of Ayumi. She devises a plan: first, she seduces the department chief, using her body to capture his heart. Next, she forces Ayumi into raping her own husband while he's working late at the office. Using evidence of the act, Reiko begins to torment Ayumi daily, unraveling a complex web of humiliation, desire, and betrayal.