It is revealed near the end of the story that the King and Queen of the Chess Pieces are Ginta's father Danna controlled by an evil spirit called Caldia's Orb, and Dorothy's older sister Diana. Team MAR battles Caldia's Orb, Diana and the leader of the Chess Pieces' Knights, Phantom, in the floating Lestava Castle, and win, saving MAR Heaven. Ginta and Danna return home at the end of the story.