Staz is a vampire from the surreal "Demon World", and Fuyumi, an ordinary girl, accidentally wanders into the Demon World through a portal. Subsequently after meeting each other, Fuyumi is killed by a carnivorous plant and turned into a ghost, causing Staz to take responsibility and pledge to help bring her back to life.

When Tsukune accidentally enrolls in a school for monsters disguised as humans, he must hide the fact that he's really human or risk losing his life.

A half human, half Yoma monster sets out to attain justice against the evil full-breed Yomas, hideous fiends who feed ruthlessly on humanity.