In a steampunk Paris where vampires roam the streets, a young human doctor named Noé Archiviste finds his fate intertwined with the enigmatic and flamboyant Vanitas, a self-proclaimed vampire specialist who wields a mysterious, cursed book. Born under a blue moon, Vanitas claims to be a human who can heal vampires afflicted by a malady that twists them into mindless beasts, but his methods are as reckless as they are effective. Noé, driven by a personal quest to understand the truth behind the curse, becomes Vanitas’s reluctant companion. Together, they navigate a world of ancient grudges, political intrigue, and dark secrets, all while confronting the monstrous consequences of the curse. This dark fantasy series blends gothic horror with a compelling character study, exploring themes of identity, prejudice, and redemption. With its lush animation and a gripping mystery at its core, the show delivers a thrilling and emotionally charged adventure through a beautifully twisted world.