Married for three years, Nakazaki-san quit her job as an insurance salesman and became a full-time housewife, which was her dream. However, she found herself getting used to a life that was more repetitive than she had imagined, and it became a rut. She would occasionally go out to eat or shop with friends to distract herself, but when she was invited to a drinking party as usual, she ended up having a relationship with a man she met there. And although she felt guilty towards her husband, her sexual desire got the better of her, and their affair gradually deepened.