Once upon a time in the faraway kingdom of Silverland, a princess named Sapphire was born with both the blue heart of a boy and the pink heart of a girl. By law, only a son could inherit the throne, so to stop the evil Duke Duralumon from being next in line to rule the kingdom, the King announced that Sapphire was a boy. Now several years later, everyone in the kingdom sees Sapphire as a swashbuckling prince and very few people know her secret. But the Duke still lurks in the shadows, waiting for a chance to make his move.