"Practical sex education," which was introduced as part of measures to combat the declining birthrate, is sex education in which teachers "directly" teach using their own bodies. A married female teacher, married for five years, has long been troubled by not being able to have children, but she decides to use her own body to teach sex education to her students! A vivid lesson begins right in front of the students! She didn't think she could get pregnant, but at the end, an unexpected development occurs!