The story of a possessed person in a book who will kill to achieve her goals. Brinny, who had been living in obedience to her stepfather, thought it had nothing to do with her—until she became entangled in an incident with the ailing second prince, Lucian. In a moment of crisis, Brinny unleashes her extraordinary strength to save Lucian, and upon seeing the possessed person, Aridna, captured, she feels relieved that all is well. However, her beloved sister and the first prince die in a carriage accident, and even Lucian, who became her fiancé, begins to act strangely. Wasn't the possessed person executed in the past? Is Aridna still alive? Brinny resolves to reclaim the void left by the disappearance of her loved ones. She will fight the possessed person.