In 20XX, new female teachers were face-picked into our school's traditional sex education curriculum under the educational reform of "expanding the time to hold a stick rather than a pen" in the compulsory education curriculum due to Japan's serious measures against the declining birthrate. For the sake of the male students who will lead the future, they will be naked themselves and experience the "difference between male and female genitals" and "the mechanism of pregnancy" with their five senses, and learn how good SEX feels.