Lucy Demoniesse, the girl who can't rember her past and started to live a new life. A life living with the pureblood vampires, and a prince called Lucian Grey, one of the elite vampires that is known for being the most powerful and influencial, and the one who only knows what her past is, and a reason to hide his identity as "Dark". So many pains in the past that Lucian don't want her to know. The past that is full of blood and thirst that any humans can't take the risk to look at their beloved sucking by a vampire. Lucian whom is disgusted to a vampire, and even him is disgusted by himself. For him becoming a vampire is like peeling your skin alive. Everyday, suffering from the thirst of blood. He doesn't want Lucy to feel the same and doesn't want her to know how awful he had become. To protect a fragile human, would he take the risk to protect her from becoming a vampire? Even he, himself is a vampire that blood for them is a pleasurable desire.