Nina, a young girl from the Magic Kingdom, is a candidate for princess. She travels to Earth to search for Holy Stones required for her to be qualified as a candidate. On Earth, she meets Ayu Tateishi, who right away discovered her magical powers and who eventually became her best friend. They continue their friendship as Ayu further learns about Nina's mission. Finally, she collected the 5 Holy Stones. But, a dilemma then came. Nina cannot decipher on what road will she take-is it to become a princess, or remain on Earth with her friends...