Kaito Sena dies in his original world and is reborn before Elisabeth Le Fanu, the feared woman known as the Torture Princess. Elisabeth gives him little real choice about becoming her servant and recruits him into a mission to defeat fourteen powerful demons and their contractors. Kaito’s second life becomes bound to a master condemned by the very world she protects, forcing him to decide what loyalty means when both cruelty and sacrifice can belong to the same person.