The second princess, Charles, is looked down upon by those around her as the "Plain Princess" due to her average appearance. One day, her fiancé Albert, who fell in love at first sight with her younger sister Elruca, proposes to annul their engagement. Triggered by this, she is stripped of her royal status and ordered to be exiled from the country. "With this, I can finally live without holding back." And so, she reveals her hidden true identity.