Natsume, a sophomore in college, consults with Fumi about a dispute she has with her first boyfriend, Ren. Fumi is also a second-year university student, and a perfect childhood friend of Natsume, who has a beautiful eyebrow and excellent grades. Natsume has been taking care of him since childhood. That night, Natsume falls asleep after drinking alcohol. Luckily she doesn't wake up, Fumi begins to develop Natsume's body night after night. And Fumi is forced to act, but the true intention is unknown .... A few days later, Natsume barely remembers what happened that night. Then Ren appears and tries to make up, but Fumi's jealousy comes to the fore...