Yusei and Kitayama are classmates and best friends. They weren't particularly conspicuous students, but they had a secret. It is said that he colluded with his chemistry teacher, Kita, and repeated the despicable act of making female teachers and female students drink aphrodisiacs and make them fall into sexual acts. At first, he was just amused and offered his female friends, but eventually Kita took an overbearing attitude and even said, "If you don't give me a woman regularly, you won't get credit!" And finally, Megumi, who is a eugenic mother-in-law, is the target of her poisonous fangs.
