To combat declining birth rates, the government has passed a law requiring female students to attend their classes naked once a week, and to consent to all requests for sex on Naked Attendance Days. Ayase and her friend Mayu have begrudgingly gotten used to their new lives as weekly free-use sex slaves, but this week's Naked Attendance Day might be longer and harder than they're prepared to take...

In order to combat declining birthrates, the government has introduced a new mandatory course for students: Fuck Buddy Training. Once each week, girls are assigned men to "practice" having sex with. If you skip out, you can't graduate, and if you get a bad grade, you're assigned "remedial coursework" until you've learned your lesson! How will straitlaced Ayase and easygoing Mayu fare in this week's classes?