As a countermeasure against unprecedented population decline, the Sex Education Committee introduced a policy known as the "Next-Generation Population Development Basic Act," commonly referred to as the ND Law—or the "Creampie Law." This law aims to encourage natural pregnancy by allowing young people to experience the pleasure of creampie sex. Selected as a model case, Natsuno Chinami is ordered to help fellow students discover the ecstasy of creampie intercourse, serving as an officially sanctioned outlet for sexual release. Following her teacher's instructions, she gradually becomes aroused as she offers her body, eventually growing unable to resist the overwhelming sensations of creampie sex. From morning until afternoon, and even after school, she is repeatedly creampie-fucked without restraint by male students, becoming increasingly obsessed with the pleasure.