Charlotte, the third princess of the Kingdom of Forsyth, was treated poorly as a fake princess. One day, a mysterious man bursts into a ball and curses her while protecting her sister. She is confined to a villa in the north under the pretext of medical treatment... but the curse has turned her into a little girl?! She makes a fresh start and devotes herself to researching magical plants, but then she receives a letter. "Waah! I'm engaged?!" When she meets Leon, the head of the duke's family, she accidentally lies to him about her little girl appearance, saying she's "Shirley, the maid!"