At the beginning of heaven and earth, the world was in chaos. The Emperor of Heaven created the heaven (the twelve constellations and angels we now know) and the human world. At the same time, due to the excessive consumption of magic, the chaos of magic caused the emergence of the devil. In order to stabilize the world, the Emperor of Heaven sent angels and generals headed by the Archangel to start a war between the devil and the black angels and demon generals of Satan. The war between heaven and demons that lasted for three thousand years has finally come to an end. The heaven has lost countless heavenly generals and angels, but under this seemingly calm surface, there are still hidden turbulences. The angels of darkness have not been completely eradicated, and they are still harming mankind in the human world. Therefore, the Emperor of Heaven sent the twelve constellation envoys to the human world to eliminate the remnants of the demon world.