A prehistoric tribe of the Ulamors, who have lost fire—the source of life, warmth, and protection—in a clash with their enemies, is doomed to die. Young warrior Nao, the son of Leopard, vows to bring the flame back. Together with two companions, he sets off on a journey through a primal world filled with deadly dangers: monstrous predators, hostile tribes, and unknown forces of nature—where every moment is a fight for survival.