Sixty-five million years ago, the twin princesses of the planet Ascera were cursed by their sister Mars and condemned to a life as commoners on their own planet, without magic. Now that planet is called Earth, and Princess Sierra has reincarnated, as a twelve-year-old girl named Celeste Ogata. Separated from her beloved sister Ischa, she's got to figure out how to find her and get their powers back, and reclaim the planet that was once theirs.