A world where humans and vampires coexist. The “blood-sucking addiction” that only a mixed blood of the two races can develop has become a social problem. Hoshimori-san, the popular gal in class, is actually a “blood-sucking addict,” and when she wants blood, she is different and bolder than usual...! Only Hiyoshi, a serious, brooding guy, knows about this fact... A month of secrets to overcome the blood-sucking addiction begins...!