Best friends Mairi and Rena. One day, during their usual tea party, the conversation turned to sex life. Rena seems to be having a fulfilling sex life with a young man she met on an app, and she half-forcibly recommends the app to the introverted Mairi for 'just one time'... Thus began Mairi's journey with the app where she meets Shiji, an obedient and honest cute boy. Mairi gradually becomes addicted to the pleasure of dominating someone younger, slowly drowning both her heart and body in the dangerous game with a younger partner―.
