Akemi Ehara is a 51-year-old housewife. Her husband constantly calls late every day saying, "I can't come home tonight," leaving her mostly alone. Overcome by loneliness, she turns to phone sex. One day, her son catches her in the act, and they begin a temporary relationship. However, as her husband continues coming home late, her son grows increasingly attentive toward her, unexpectedly deepening their bond. She never imagined things would take such a turn.