There are dark worlds where numerous races of demons live, light worlds where people and higher beings live, whose life is long and their powers are limitless, and there are gray worlds where the first and second wage an endlessly long war with each other. And when the fragile balance is disrupted, rifts begin to appear between the worlds, allowing its inhabitants to travel between them. For twenty years, our world has become accustomed to faults, people have learned to deal with them. But the day is approaching when an army of hungry demons will simultaneously pour through hundreds of thousands of gates to wipe out cities from the face of the earth and shed rivers of blood. People turned to higher light beings for help, but they can only prepare them for the inevitable.