Plagued by a mysterious illness that devastates her body and spirit, Lidy is abandoned by her family and endures a harsh, solitary existence. Her fate takes a darker turn when her parents offer her as a "sacrifice" to the Vampire Duke, Evariste—a being who embraced vampirism to protect the kingdom. Resigned, Lidy journeys to meet him, only to discover that Evariste is far from the terrifying figure of rumor, treating her with unexpected kindness and respect.