Yui, a black-haired girl, is in love with her beautiful teacher, Rena. She doesn't listen to the lectures and just stares at them... Rena notices her feelings, and they have their first kiss in the classroom, where someone might show up... Their lips touch, and their sexual desire escalates... They skip gym class to have sex in bloomers, and their lesbian love deepens as they caress each other undisturbed on Rena's bed... The pure feelings of their forbidden relationship, as they love each other so much that they break...