Nina, the princess of Wyndia's kingdom, went out in search of her missing sister in the desert with Cray, leader of the Woren clan. The young girl is not at the end of her surprises: she suddenly falls on a dragon and then on the inanimate body of a mysterious boy The young Ryu also ignores everything about the fate that awaits her: heir to an ancient civilization, he has the power to transform himself into a dragon and the duty to block the road to an evil emperor.