Dou Long Zhanshi 4 Shuanglong He

Synopsis

Suddenly, there will be a series of abnormal phenomena: the human world is shocked by primitive dinosaurs, the Alida star beast base is invaded by the ancestor of the dinosaur beast dragon, etc. Why did this strange thing happen? The answer is actually related to the loss of Long Yuanji's guarding order-the dragon's secret order! How will Dragon Fighters fight against this dark power of unknown origin? What hardships will they face? Can the human world return to peace? With this series of questions, Dragon Fighters, start a new journey! (translated from douban)