Novelist Takashi lives an ordinary life with his wife, Junko, and their son. Recently, Junko has developed a habit of meeting her mom friend, Rara Matsu, at home twice a week to enjoy yoga together. Rara has glossy long black hair, a beautiful traditional Japanese face, and a toned, mature figure. Takashi finds himself increasingly attracted to her and starts plotting ways to make his move. One day, Junko temporarily leaves the house, leaving Takashi and Rara alone together. This unexpected situation becomes the catalyst that fuels Takashi's growing desire.