In society, they are just any ordinary, cold-hearted couple. The wife, Kazuko, is feeling lonely and comforts herself by having phone sex with her lover. The husband happens to witness the scene and feels angry, but at the same time, realizes his lack of interest in Kazuko. Realizing that things can't go on like this, the husband looks up information on "the sex lives of middle-aged couples" on the Internet... Though confused and awkward, their sex life slowly deepens their love for each other. As the years go by, the couple tries to rekindle their flames...