Long ago, the world was inhabited by dragons. They were cruel and powerful rulers who oppressed the common people. Seeing this, God sent guards called to free humanity from the yoke of dragons. Subsequently, all dragons were destroyed. Many years later, 2 miners discover a petrified crystal in which the last representative of the dragon family, Rui, has frozen. However, Rui is still just a child who knows nothing about his origin or the sad fate of his people. Without thinking twice, the miners decide to sell the "curiosity", but no such luck, Rui breaks out of captivity. Adventure begins!