Sex=Love²  

Sex=Love²: Dangerous Equation, Sex=Love^2, Sex=Love2; Sex=Love^2

Kumiko desires to become a teacher, but her father opposes it vehemently. He grants her one opportunity to demonstrate her abilities as a teacher before permanently forbidding her from pursuing this career path. Introducing Ryu-kun, Kumiko's newest student who is not interested in learning from his teachers and instead teaches them about sex.