Lesson.1 Starlet Kyo-chan and Aya are childhood friends who are a little older. On the day Kyo-chan is assigned to Aya's school as a school doctor, Aya dedicates her virginity to Kyo-chan as a celebration. Kyo-chan started living alone when she got a job. He has a fulfilling life as a school doctor at a girls' school. However, when Aya often comes to the health room with a false illness, he asks for sex. Kyo-chan tries to poke her because she's at work, but she can't beat Aya's temptation. And he still has sex in the infirmary today. Aya is not satisfied with the first round and hopes for the second round, but she is disturbed by the teacher who came to the health room because she was worried about Aya. Lesson.2 Sealed aquarium Kuonji mermaid and knight who succeeded a large company due to the sudden accidental death of his parents. Mermaids sell their bodies to get loans and aid to keep the company alive. The knight, who has exceeded the limits of his sister's appearance, devoting himself to a man day after day, asks the mermaid to kill her. However, the mermaid scolds such a knight for regaining the same sadness that he lost his parents, and he apologizes that he will die as much as the knight dies. The knight recovers from the words of his sister, who should have been more painful than himself, and the two who have a mutual understanding are connected physically.