Unfulfilled housewife Miho unexpectedly reunites with her former driving instructor, with whom she once shared an affair and repeated kisses during lessons. She had broken it off while some restraint remained, but the reunion reignites their desire. They fuck so passionately inside the car that their breath and body heat fog the windows, then start meeting at hotels under the pretense that she is going out with friends. Eventually she even brings the affair into the marital home while her husband is away, and can no longer stop.