As part of measures to combat declining birth rates, "practical sex education" has been introduced—an innovative teaching method where instructors use their own bodies for direct instruction. However, some students struggle to keep up with the lessons. For these students, the beautiful private tutor, Teacher Matsuna, visits the homes of teenage virgin boys to provide hands-on sex education. In the first session, the student witnesses Teacher Matsuna having sex with a male teacher. In the next session, she takes the lead, guiding him through real intercourse aimed at baby-making. The series unfolds through direct, intimate experiences, culminating in the boy's first experience of conception and pregnancy.