Sadie, who was a Count's daughter, had made a name for herself as the villainess of the century while her body was possessed for ten years. She returned to normal right in the middle of being issued a Marriage Annulment by the Knight Commander, Rufus. Even when she tells the truth that she was "possessed," he doesn't believe her, so Sadie begins to search for the culprit and the cause of her stolen body. Meanwhile, Rufus cannot hide his confusion at Sadie, whose personality suddenly changed... An Isekai Fantasy of unrequited love on both sides, where two people who constantly misunderstand each other slowly draw closer.