Close mom friends Ryo and Kaoru. One day, as usual during their tea party, the topic turned to sex life. Kaoru seems to be having fulfilling sex with a young man she met on an app, and even Ryo, who had thought it was sleazy, finds herself agreeing to try the app just this once… The student Keigen she meets on the app is obedient, and Ryo awakens to the pleasure of dominance. Meanwhile, Keigen too becomes engrossed in both mind and body by Kaoru's alluring charm and her relentless advances―.
