Light Novel (Other) Women Dressed as a man, the princess is also on duty at the moment! Regina Books

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Eleanor, a man of his grandfather's brain, and a triumphant Eleanor. Enchanted by the beauty of Princess Beatrice, she pretended to be a man and became Princess's Kingsguard. One day, when Beatrice had an arranged marriage with a neighboring prince, she exchanged her body with Eleanor in a strange mirror and fled the castle! Eleanor, who was forced to act as a substitute, failed in the arranged marriage, but somehow the prince fell in love with her --? Dotabata Love Fantasy between a fake princess and a crooked prince!