God created paradise, where the angels lived, and the Earth, populated by humans. The humans were not content with their fate and rebelled against God. But as a result, demons invaded the Earth, led by Satan himself. The proud humans of the city Sodom started building the Tower of Babel (sic), trying to reach the skies. God sent a high-ranked seraph named Alucard to reason with humans. However, archangel Michael thought differently, figuring that the humans deserved no forgiveness. Meanwhile, the Satan has his own plans...