In the kingdom of Silverland, the King and the Queen have a daughter who is raised as a boy and a prince (females are not eligible to reign) to prevent the evil Duke Duralumon from inheriting the throne. Duralumon plots to expose her true gender. Accompanied by the angel Choppy, Sapphire goes to the forest and defeats a man-eating wolf. As she does so, Sapphire thwarts Duralumon's plan to get the Queen to confess Sapphire's secret.