When his wife Rika comes home late at night, she finds lipstick marks on her husband's shirt. Unable to contain her anxiety, Rika picks up her husband's cell phone and learns about Reiko, who is at work as her husband. With her resolve, Rika heads to her husband's workplace and meets Reiko. However, Reiko was not even surprised, and touched Rika's body as if she had been waiting. Rika can't resist and feels aroused when she is given an aphrodisiac mixed into the tea she serves. Reiko, who thought her husband was her affair partner, had Rika from the beginning...