Yurie, 42 years old, married for 13 years, no children, works at the reception of a sports gym. Her husband, who works for a transportation company, became responsible for long-distance routes and is away on business half the month. Naturally, they have become sexless. Seeing men sweating at her part-time job makes her body heat up, and she ends up masturbating in the gym's toilet. Before she knows it, she boards the train with a vibrator inserted, always in a state of sexual frustration. One day, a man sitting across from her finds out, and she follows him to his room and has sex. Since then, she has been in a relationship where she is summoned by the man.
