The annulment of Aileen Lauren Dautriche's engagement to crown prince Cedric Jeanne Elmir in favor of Lilia Rainworth sets off a life-changing chain of events. Memories from a past life inundate Aileen's thoughts as she discovers that she has been reincarnated as the villainess from an otome game who is destined for an inevitable demise. Her only chance to break the cycle is to court Claude Jeanne Elmir - the game's final boss and Cedric's half-brother, who is also known as the Demon King. However, Aileen struggles to win Claude's trust as he remains skeptical of her motives. Despite the odds, Aileen is determined to capture his heart by helping him achieve his objective of establishing peaceful relations between humans and demons. With time running out, Aileen must use all her resources to rewrite her own story and change Claude's fate.