Maki, a wife, has been married to her husband for 15 years and is not unhappy, but she feels lonely in her monotonous married life where the same things seem to be repeated every day. She no longer has sex with her husband and begins to question the idea of ​​just growing older in life. One day, Maki happens to meet Ikeda, one of her husband's subordinates, and the two gradually become involved in a man-woman relationship. Although she feels guilty towards her husband, she becomes Maki to the pleasure of sex, which she has not experienced in a long time...