Runa has a crush on the kind and handsome teacher Itsuki Saiku. However, one day, she discovers that her teacher is actually a scumbag with no ethical standards...! "Every day, I was teased all over the school by my sadistic, sarcastic, and naughty teacher. Even though I know I can't get serious, I can't stop my heart pounding!" A forbidden love story between the worst scumbag teacher ever and a high school girl!