Rie, a former teacher, is married to her colleague Tsutomu and is now trying to conceive a child. However, she becomes suspicious when she finds numerous missed calls from a woman named Satsuki on her husband's phone. Gathering her courage, she confronts her husband, who explains that Satsuki is a colleague who replaced Rie and that their frequent contact is unavoidable due to work. The next day, Tsutomu is at Satsuki's apartment. Satsuki is actually a hostess at a cabaret club, and the two have been secretly meeting, seemingly enjoying a game of romance...