The manga's story is set in Blood Night town, a place where vampires seeking blood and humans looking for blood buyers gather. Sotetsu, a human who is branded as "wasted blood," or a blood that no one wants, works for an organization that cracks down on vampires' illegal activities, called the Blood Control Bureau. One day, Sotetsu meets a mysterious vampire who claims to be a food (or blood) connoisseur. A suspenseful battle of courtship and salvation begins.
Source: ANN