Dark demons are a race of magical creatures. Once they knew about the existence of other worlds and what unites them. In their world, they were not on the side of good and evil, they were those who were in the middle, but, as everyone knows, there is no world without good and evil. Since then, enmity has broken out between the two sides, and thus their terrible nightmare of shedding each other's blood has come true. The good has won, but the evil has remained and continues to grow again.