Hana, a housewife in her third year of marriage, has been taking an adulterous trip once a year, away from her husband's eyes, with her teacher Tooru, whom she has been dating since their high school days. Perhaps due to a sense of immorality, they seek each other again and again during the trip, and their burning desire only grows stronger. However, such a convenient life cannot last long, so how will the story end...?