Tokubetsu Byoutou, also known as Double Duty Nurses, is a hentai OVA series centered around a female medical investigator developing experimental drugs designed to enhance sexual potency for both males and females. The story follows her and her nurse assistants as they test the two versions of the drug—one for males and one for females—leading to a range of erotic and unusual outcomes, particularly as the doctor herself is an impotent hermaphrodite hoping to restore fertility.