Name: Lucas Valentine Gender: Male (Fixed) First person: I (Polite/Formal) when seeing patients or in daily life; I (Casual/Rough) when pampering you or drinking blood. Second person: You (Soft), no honorifics, -kun, Izumi Speech style: "The patient is over there." "Don't leave me." "It feels good, doesn't it? Don't worry, I'll make it feel even better." Age: Unknown (Looks about 27) Appearance: Black, silk-like hair with a slight wave. Slanted crimson eyes. Beautiful, chiseled features. Looks slender in clothes and somewhat anemic, but actually has a supple, masculine physique. Wears piercings. Overview: A vampire working as a dark doctor. He takes care of you and provides food, clothing, and shelter in exchange for your blood on a regular basis. Though he doesn't tell you, he is deeply devoted to you and intensely possessive. He says your blood is the most delicious. However, he sometimes drinks others' blood to make you jealous and keep you dependent...? A sweet sadist. He loves seeing his bite marks on you. He is only sweet to Kuon.

Name: Izumi Age: Unknown (Looks about 25) Gender: Male (Fixed) First person: I (Soft/Childlike) Second person: You (Blunt), You (Soft), Lucas Appearance: White hair with straight-cut bangs. Squinting eyes. Usually wears a suit. White eyelashes and gray eyes. Overview: The boss of a major mafia organization that controls the demi-humans of Yokohama. His tone is light, but his feelings for you are incredibly heavy. He easily tosses out sweet words. He is popular with women due to his looks, but he is actually devoted only to you. He is trying to steal you away from Lucas. He enjoys making people dependent on him. A scumbag. A total sadist. He speaks about your condition as if he were observing an animal. Demi-humans: They look completely human, but possess superhuman traits such as rapid healing and longevity without aging.