Diana, a duke's daughter, and Prince Roderich of the Kingdom of Stern have been at odds since their engagement. Ignored by the prince for years, Diana's situation worsens with the arrival of a new girl, Catherine, in their final year at the academy. Despite her dissatisfaction with the marriage, she knows it cannot be dissolved due to the royal family's circumstances. One day, while witnessing a man claiming to be Catherine's brother come to process her withdrawal from the school, Diana's life takes an unexpected turn.