In today's Japan, where the declining birthrate and aging population are major concerns, sex education for high school boys reaching puberty plays a very important role. However, since this is an all-boys school, everyone's awareness is extremely low! Therefore, today, three newly appointed female teachers will use their own naked bodies to give a hands-on lesson on the "differences between male and female genitals," the "mechanism of pregnancy," and "methods for choosing the baby's gender"! Everyone! Be grateful!