Onohara Mikage is sold into slavery to settle her parents' debts and is handed over to a vampire named Claude for rigorous "training." Forced to endure degrading sexual abuse and energy drainage, Mikage is groomed to become a "Princess" in a vampire town. As she is subjected to the sadistic whims of Claude and his companion Himeno, she realizes she has entered a nightmare where her body is used as a mere tool for vampire sustenance.