Queen Kristian, a young ruler of a kingdom, was framed for a crime she did not commit by her jealous half-sister and executed at the age of sixteen. However, death was not the end. Before her execution, Kristian made a desperate contract with a handsome demon, trading her soul in exchange for a second chance at life and the power to enact her revenge. Sixteen years after her death, during the birthday celebrations for the queen who usurped her, a young noblewoman named Tiaresia, the daughter of a duke, prepares for her society debut. Tiaresia is the reincarnation of the late Queen Kristian, having been reborn into a new body with her memories and vendetta intact.

At her side constantly is her loyal and strikingly beautiful servant, whose true identity is the demon from her contract. He has patiently watched over her for years and now grows impatient to collect his due, his demonic power serving as the instrument of her vengeance. Together, the reincarnated noble lady and her demonic butler begin a calculated scheme to dismantle everything her half-sister has built. Their quest for retribution unfolds within a world of aristocratic balls, political maneuvering, and social intrigue, where every smile can hide a dagger.

The story follows Tiaresia as she navigates high society, using her knowledge from her past life and her servant's supernatural abilities to identify and target those who wronged her. Demonic power allows for a path of revenge that is both magical and psychological, avoiding simple brute force in favor of elegant ruin. As the plot progresses, the relationship between Tiaresia and the demon servant deepens, blending the business-like terms of their magical contract with growing personal tension. The central conflict pits her desire for a cold, calculated payback against the costs it exacts on her new life and the growing impatience of a demon waiting for his reward. Notable narrative arcs include Tiaresia’s re-entry into the royal court, the public humiliation and downfall of key conspirators from her previous life, and the development of the fraught partnership between a vengeful noblewoman and the otherworldly being who holds the deed to her soul. The manga traces this journey from the initial reincarnation to the ultimate, tragic conclusion of her revenge contract.