Ryo and Kaho are good friends who are mothers. One day, while having a tea party as usual, the topic turned to sex life. Kaho met a young man through an app and seems to be having a fulfilling sex life. Ryo, who thought it was shady, is swayed and starts using the app, thinking "It'll be just Ryo." Ryo meets Yuzuru, a student through the app, and Ryo to the pleasure of being submissive and dominating. Yuzuru is also drowning in both Kokoro and body in the allure and sex appeal of the married woman.