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 year to determine whether it is useful, and consequently, if Erika will inherit the crown.