The Case Study Of Vanitas, Vol. 1 by Jun Mochizuki

Set in a fantastical 19th-century Paris, the story follows Noé Archiviste, a young vampire on a quest to find the Book of Vanitas, a mysterious grimoire said to hold the power to cure cursed vampires. His journey leads him to Vanitas, a human claiming to be a doctor for vampires, who wields the very book Noé seeks. Together, they embark on a thrilling adventure to save vampires from a mysterious affliction, unraveling secrets and confronting dangerous foes along the way, all while questioning the true nature of the book and its enigmatic owner.

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