A world where "practical sex education" exists, which was introduced as a measure to combat the declining birthrate. It is a new type of sex education in which men and women actually have sex and impregnate each other in school classes, teaching about sex. In order to become the teacher of a sex education class, female teacher Nonoka Sato learns from a veteran male teacher how to teach sex education by having sex as a practical lesson, and outside of school she learns about adult toys while trying them out, and then teaches them to her students using her own body...She has raw sex with a student, makes him cum inside her, and then impregnates him, completing the education. Enjoy Sato-sensei, who teaches sex education with lots of naughty body and impregnation-related rhetoric!