Chiho Kadokura is 27 years old, married for four years, and has no children. She married her sailor husband at age 23 and has lived along the Kyushu Monorail since then. However, when her husband goes out to sea for work and doesn't come home for a week, Chiho finds herself with a lot of free time, so she starts working part-time three days a week. The conversations she hears among the housewives working there are always about infidelity and other stimulating topics, and after not having sex for over two years, Chiho decided to apply for this job, wanting to have an exciting experience herself.