Megumi Fujimiya is the masturbation pet idol of the school's male students. A pure schoolgirl in the throes of adolescence who has just become lovers with her childhood friend and baseball team ace, Takashi Katayama... There, a life guidance teacher appears with a mysterious Life Teaching Notebook that can alter the perception of others. "Fujimiya...are you forgetting that students who have a lover must take sexual activity instruction as a compulsory subject?" I'm sorry... I can't believe I forgot something so important! Megumi, who was shown a notebook and had her perception altered, undergoes "sexual activity instruction" in the infirmary where her genetic juices are poured into her womb without any contraceptives, as Fukama tells her to do - and she is forced to undergo the repair work.