Kanna, a novelist who secretly writes erotic fiction, and her friend Yuri, are having their usual tea party. The conversation naturally turns to sex, and Yuri reveals she's having a fulfilling sex life with someone she met on a dating app. Even though Kanna is usually shy, Yuri persuades her to try the app, claiming it's for research material. Through the app, they meet Taichi, a sweet and obedient college student. As Kanna experiences the thrill of dominating a younger man, she gradually becomes consumed by their relationship.
