Encouraging diverse thinking, the Huaxia Continent is fragmented by a group of independent warlords. Before her sixteenth birthday, the girl Long Mian accidentally wakens the power of dragon blood in her body and turns into a black dragon that can only be encountered once every one thousand years. And the mysterious boy becomes her Loong, after that the two of they go through think and thin together. To put an end to the fragmentation and remould the ideal of unification, they two start a journey to each states...