Kayama Rika (香山リカ) is a 4th grader in Saint Terejia Gakuen. However, she is also a princess of Doll Land. (But she doesn't know it.)

Rika was given a bracelet, called "Calling Ring", that she wears all the time. When Rika gets in a dangerous situation, the bracelet rings, and sends a signal to her grandmother. Then Doll Licca comes to the rescue.