Yusei and Kitayama are classmates and best friends. They weren't the students to stand out, but they had a secret. It is said that he colluded with Kita, a chemistry teacher, and repeated the despicable act of making female teachers and female students drink aphrodisiacs and fall into sexual activity. At first, I was just amused and offered my girlfriend, but eventually Kita became overwhelmed and even said, "If you don't give me a woman on a regular basis, there will be no credit!" Finally, the eugenic mother-in-law, Megumi, was turned to the point of her poisonous fangs.