義妹が聖女だからと婚約破棄されましたが、私は妖精の愛し子です

During the Saint’s Ceremony, Lady Margaret, the duke’s daughter, fails to show any power and is promptly dumped by her fiance, the prince. Soon after, rumors spread that her stepsister might be the true Saint…but Margaret is hiding a secret power of her own: she can speak with fairies. Finally free from the obnoxious prince and her scheming stepsister, she looks forward to a peaceful life chatting with the fairies at the academy… until the serious Count’s son, Lord Lewis, happens to catch her in the act!? (Source: KADOKAWA Global)