Sisters Hinako and Kiyoka are in an incestuous lesbian relationship. The younger sister's diagnosis is "Congenital Abnormal Sexual Deviance." She's obsessed with fantasies of devouring women and indulges in masturbation whenever she gets the chance—a truly depraved woman. The older sister is the outlet for her sister's lust, a sex slave. The younger sister will go insane if her carnal desires aren't 80% satisfied, so the older sister gives her her naked body 200% more than necessary. They are captivated by pleasure from which there is no return. These sisters are incestuous...