Hiroshi admires his classmate Noboru, who continues to create erotic trends at school. "Procurement" of erotic books, and "distribution" to classmates... Noboru has been called "Erotic Professor" since someday. One day, Hiroshi visits Noboru's house, which he had always wanted. Erotic books are scattered in the room... and Hiroshi meets Suzune, the mother of Noboru, the creator of "Erotic Professor". A few days later, Hiroshi is alone with Suzune at the Yakami family, but...
