Ririko works part-time as an office clerk, but her plain appearance gets no attention from the younger employees, and even her husband has lost interest in her. Masturbation is the only relief from her loneliness and unusually strong sex drive. Then, at a pub with coworkers, she overhears a young man say he would sleep with a mature woman for 30,000 yen. Though he finds her approach suspicious, they exchange contact details and arrange to meet. Fighting to contain her nerves and excitement, Ririko arrives clutching a brown envelope filled with the promised cash...