A hot high school teacher, Kasumi, and her sexy younger Sis, Kaho, are in deep debt to a local gangster. Okura, a male student, learns of their predicament and offers to pay their debt in exchanged for some very special favors. In exchange for his charitable gesture, the girls must become his personal sex slaves and satisfy his every desire until their debt is fully paid off. With little choice, the Siss must quickly make their decision and proceed with caution!