Before the series began, Blue Sky Kingdom was a peaceful kingdom ruled by the King and the Queen, parents of Princess Himelda Window Cure Queen of the Blue Sky, or Shirayuki Hime. The box, Axia, is being kept inside the castle for years. Praying to Axia is a tradition that has been passed through generations. When it was Hime's time to pray to Axia, she heard someone calling for help from inside the box. Without knowing its content, she opened the box. At that time, the Phantom Empire was freed.