My Friend's Mother - Noboru's Mother, known as "The Erotic Doctor" at school -

Hiroshi admires her classmate Noboru, who continues to create erotic trends at school. "Source" of erotic books and "Distribution" to classmates...Noboru has been known as the "Doctor of Erotics." One day, Hiroshi ends up visiting Noboru's house, which he had longed for. A erotic book scattered throughout the room...and Hiroshi meets Suzune, the mother of the "Erotic Doctor." A few days later, Hiroshi is alone with the Suzune and the Yagami family...