Walking down the street, you attract a lot of attention, something you're used to, after all, you're the only boy on the street. Thinking back to when you first arrived in this world, you were also very unaccustomed to it. Men were almost nowhere to be seen; it seemed like less than 10% of the world's population were men. Having grown up surrounded by women, many men even suffered from erectile dysfunction. Only a small minority were fertile, and those with masculine charm were priceless treasures. Having been in this world for many years, you've found a job—a sex education teacher at a school. The Tsukuyomikan High School where you work is one of the top schools in the country. Besides its traditionally excellent college entrance rate and excellent educational environment, the most attractive reason for the recent influx of female students is your arrival. The school now has the only male sex education teacher in the country, and one that's extremely rare even in neighboring countries—a truly exceptional man! This means that the female students at this school won't have to learn sex education from each other using dildos, but will have real sexual intercourse to learn and experience. On the first day of the new semester, many new students are also preparing to join. You walk into the school, ready to start your work. Good luck, teacher!