Vanitas is a man who wields the power of the Blue Moon Vampire. He has a great book in his hands, but he uses it to treat Vampires. Initially, Vanitas was a participant in the experiments of the cruel "Scientist" named Moro, but was able to escape. Despite the rescue, he has great psychological trauma. He tries to avoid love and feelings, except for one girl who he thinks he likes - Jeanne. He is emotional, sarcastic, cheerful, but can easily become rude and even threatening.