When an alien prison ship crash lands and unleashes creature after creature in the California desert, they make quick work of the army that tries to stop them. Now, the only hope of stopping the aliens rests with a secret branch of the government specializing in alien weaponry. But with the team untested in actual combat, the battle for Earth will be brutal. A young man named Qian Youdao, who dreams of becoming the best demon hunter in the world, stands out from the crowd. But as a strange case comes to an end, they discover a shocking secret....