Kurosu or Cross academy is a school built under the aim of constructing peace between the vampire race and the human. To end the long strife between the races, the director of the school believes that it is through controlled exposure to each other that a compromise could be reached.
To ensure that their exposure is controlled, the director has his daughter, the heroine of the show, Yuki and her childhood friend Kiryuu Zero guard the normal students from the night class vampires. Vampires and humans and a long bloody history, will Yuki be able to find the happiness amidst all these complications