Kana Takachiho, despite her disadvantages, is a pretty nice girl. She's friendly, outgoing, and used to be good at sports until she was injured in a freak accident, losing the scholarship keeping her in school, and earning her the disdain of her fellow classmates. Oh, and her childhood friend and (self-proclaimed) boyfriend, Aki, just so happens to be a vampire who turned her into his slave after drinking her blood on their first date. But Aki's not just any vampire; he's a Pureblood, and he's participating in a game to find the seven “Stigmas” in order to wake his twin brother and Kana's other childhood friend, Eriya, from his mysterious slumber…