In the Huaxia Continent, fragmented by contending powers, a young girl, Long Mian, awoken the dragon blood within her on the eve of her 16th birthday, and she morphed into a Black Dragon, a being that appeared once a millennium. A 17-year-old mysterious young boy, Su Qianyi, became her dragon companion. Sharing the same fate and dragon power, they embark on a journey traversing the divided nations in a quest for unification.