In the Song Dynasty, the Demons Were Killed and the Sword Struck at the Gate of the Gods.

In the early years of the Northern Song Dynasty, demons appeared. In order to protect the country, Taizong established the Demon Slayer Department in accordance with the decree of "Saints of the Three Religions". The magicians were hereditary and the hierarchy was orderly. The young man Lu Guan inherited the position of his late father and wanted to take revenge according to the rules, but he was shocked in his hometown of Yanyun: what he was practicing was false law, what he was worshiping was evil thoughts, and the "demons" he killed were all unyielding heroic souls in the world! From then on, he went against heaven and vowed to seek true justice for this false "peace" with a mortal sword.