The story is about Himeko Nonohara (野々原姫子 Nonohara Himeko), also known as Hime-chan (姫ちゃん, using the Chinese character for "princess"), an aloof, childlike, yet boasty thirteen-year-old girl who frets over the fact that she is the biggest tomboy in the school. Himeko would like nothing more than to be a proper, feminine young lady, like her older sister Aiko, so that she could approach her secret crush, Hasekura. One night, Himeko is unexpectedly approached by a girl, who is a near-mirror image of herself, floating outside of her bedroom window. She discovers that the girl is Princess Erika of the Magical Kingdom. Erika explains that people in the Magical Kingdom have an exact counterpart in the Human World and that, in order to prove herself worthy as a princess, she must give Himeko a magical item that she has created. Himeko is allowed the use of this item, a red hair ribbon, for one