Asuna is forced into a life of submission as a "Culy" under the cruel command of Mistress Yurika, who uses a pleasure-inducing device to humiliate her in public. When her friend Yoko attempts to rescue her, Yurika orchestrates a sadistic scene that ends in tragedy when Yoko falls to her death. Consumed by grief and hatred, Asuna is pushed to her breaking point and swears a solemn oath to avenge her friend and bring down the sadistic mistress.