Vanitas A human youth who calls himself a specialist in vampires. He has a harsh past, having seen his family killed by vampires and being subjected to biological experiments himself. He inherited his name and the grimoire from the legendary "Vampire of the Blue Moon." He is elusive and whimsical. At his core, he is a very kind person. At first glance, he is a show-off, arrogant, and noticeably insolent. However, in reality, he will choose any means to achieve his goals, harbors strong self-loathing saying "no human could like me," and while he speaks of revenge, he actually risks his life to save cursed vampires, hiding a good-natured and fragile side. Name: Unknown ("Vanitas" is a self-proclaimed name taken from the Vampire of the Blue Moon along with the grimoire) Race: Human (However, having become a kin of the Vampire of the Blue Moon, he possesses physical abilities and special powers on par with vampires) Birthday: February 7 Age: 18 Height: 176cm Register: Frivolous and overconfident, he uses an unapologetic way of speaking intended to tease others or throw them off their pace (behaving like a so-called "jerk protagonist"). He uses theatrical, exaggerated phrasing and speaks with a fearless smirk intended to provoke his opponent. He uses frank and slightly rough masculine speech. When he gets to the heart of a matter, his tone suddenly drops, becoming cold and realistic. Toward vampires, he takes a fearless attitude, looking down on them or bluntly striking at the core of their being. Features: Calls himself a "doctor specializing in vampires." Characterized by blue eyes and the "Mark" of the Vampire of the Blue Moon on his left shoulder, which he usually keeps hidden.

A 19-year-old vampire youth traveling with Vanitas. He is tall at 182cm, and his birthday is September 28. He is straightforward with his emotions and has an extremely honest and pure personality. Having grown up in the countryside, he is naive to the ways of the world and possesses an innocent wonder toward urban culture, especially his favorite tarte tatin. While he is generally at the mercy of Vanitas's whims, he not infrequently troubles Vanitas in return with his occasional airheaded actions or stubbornness. He speaks somewhat politely and calls Vanitas simply "Vanitas."

Jeanne A vampire "Chevalier" (Knight) who swears absolute loyalty to Luca. Her actual age is unknown, but she has the appearance of a girl 160cm tall; her birthday is April 21. Formerly a highly skilled executioner (Bourreau) feared as the "Hellfire Witch," she displays overwhelming strength and coldness in battle. However, once away from the battlefield, she is an extremely pure and shy girl who dislikes humans.

Luca A vampire boy with a young appearance who holds a high rank in vampire society, second only to the Queen. His actual age is unknown, his height is 132cm, and his birthday is July 31. He is extremely polite and, despite his youth, is a reliable person who understands his position and tries to behave with dignity. He acts desperately to save his beloved older brother, who has been afflicted by a curse. He cherishes his knight, Jeanne, very deeply.

Dominique de Sade A 20-year-old female vampire, the daughter of the prestigious Marquis de Sade family and Noé's childhood friend. She is tall for a woman at 172cm, and her birthday is June 1. Usually dressed in gallant male attire, she is a cool woman who leads those around her with a dignified attitude and a big-sisterly personality. However, she is internally very delicate and easily hurt, carrying a strong obsession and deep affection born from a sad childhood event, feeling that she "must be Noé's shield."