Reiko abandons Yoshiki, a player who makes a living playing mahjong, and marries Abe, a young businessman whom she met at a matchmaking party. I am very satisfied financially, but there was almost no nighttime activity with my husband, and Reiko's body gradually ached. Lonely days indulging in masturbation with lewd delusions. Frustrated, Reiko seduces her son-in-law Junpei one day.