Miho and Haruna are good friends who are mothers. One day, while having a tea party as usual, the topic turned to sex life. Haruna seems to be having fulfilling sex with a young man she met on an app, and Miho, who thought it was shady, is swayed and starts using the app, thinking "It'll be just once." Miho meets Yuzuru, a student on the app, and awakens to the pleasure of being submissive and dominating. Yuzuru is also drowning in both mind and body with the married woman's seductiveness and full-on sex appeal.