In a city so over-indulgent and careless, reveling in food and sex and completely unaware of the epidemic of parasites, it's no wonder so many people are infected. Dr. Suzune Arizono isn't exactly a normal doctor. For one, she's actually a veterinarian— but her specialty is parasites, and when those parasites make a habit of nesting inside human genitalia and overriding their senses with lust, her job is bound to get more than a little messy!