In the 30th Century, the Earth has united as one country called Earth. Kyoko is the princess of the country and is protected by the last remaining of the Dragon clan (Ryuuzoku): Hizuki and his younger brother Sakataki (the prince of Ryuuzoku). She has attended primary school and junior high school and is currently in senior high where no one knows her true identity as the nation's first princess. When the Smashers gang turn up at Kyoko's and Widoshiku since their leader takes a liking to Karen (Kyoko's friend) she has no choice but to reveal her identity to save the school.

She is then offered the chance by a priest reading from a user manual, to pass the throne onto her twin sister Ui, who has been in a coma-like state since she was born. To wake her, she has to assemble 12 god stones and their owners, the "Strangers", and awaken their powers. But just as she thought she was getting close to finally being able to speak with her sister, her sister murmurs in her sleep that she was born alone.