An inevitable part of many educator's careers is having to give the dreaded sexual health class. A year into his professional career, it's finally Nagisa's turn; the only problem is he doesn't really know what he's talking about. Sure, on a practical level, he gets it, but he has no experience. Unfortunately, a slightly intoxicated Karma has a suggestion. Suddenly, it's Karma's turn to become the teacher. He's happy to help, of course, but the real question is how long can you enter a sexual relationship with your best friend (even for educational purposes) without catching feelings.