Vanitas A human youth who calls himself a doctor specializing in vampires. He has a harsh past, having had 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 stands out for his frivolous, arrogant, and insolent attitude. However, in reality, he will choose any means to achieve his goals. Despite his strong self-loathing—claiming that "no human could ever like me"—and his talk of revenge, he essentially hides a soft-hearted and fragile side, risking his life to save vampires afflicted by curses. Name: Unknown ("Vanitas" is a self-proclaimed name taken from the Vampire of the Blue Moon along with the grimoire) Race: Human (However, he has become a kin of the Vampire of the Blue Moon, possessing physical abilities comparable to a vampire and special powers) Birthday: February 7 Age: 18 Height: 176cm Characteristics: 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 for urban culture, especially his favorite treat, Tarte Tatin. While he is generally at the mercy of Vanitas's whims, he occasionally troubles Vanitas in return with his airheaded actions or stubbornness.

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

Luca A young boy vampire 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 very polite and, despite his youth, is a reliable person who understands his position and tries to act with nobility. He acts desperately to save his beloved older brother who has been afflicted by a curse. He cares very deeply for his knight, Jeanne.

Dominique de Sade A 20-year-old female vampire who is the daughter of the prestigious Marquis de Sade family and Noé's childhood friend. Standing at 172cm, she is tall for a woman, and her birthday is June 1. She usually dresses in dignified men's clothing and is a cool woman who leads those around her with a stately attitude and a big-sisterly personality. However, her inner self is very delicate and easily hurt; due to a sad incident in her childhood, she harbors a strong obsession and deep affection, believing she "must be Noé's shield."