In the near future, Japan faces severe depopulation and an aging society, with the number of children dwindling rapidly. Experts point to declining sexual desire and interest in sex among youth as a primary cause, leading to the establishment of a national Sex Education Committee. To promote reproduction, the committee enacts the "Creampie Duty Law." Under this system, selected female students are designated as model cases and become officially sanctioned outlets for sexual release, learning firsthand the pleasure of creampie sex as part of their sex education. Chosen girls must engage in continuous intercourse from morning until night, without rest even after school, satisfying the sexual needs of male students and teachers alike. An unrelenting torrent of sex becomes the symbol of school-based sexual activity.