Every year, Sumire, a teacher at a girls' school, has a relationship with a student in her class. This year, she has her eye on Monaka, who is the new homeroom teacher. Monaka is confused by Sumire's advances, but they end up in a forbidden relationship. Don't worry. I'll teach you how to love a girl. After all, I'm a teacher. Monaka feels as if an electric current is running through her body...