Three thousand nine hundred years have passed since the last war between humans and demons. The gods created a new order to check and balance the three realms. No one will remember the war of that year. The sky was full of gunpowder smoke, the corpses of people, birds and animals were scattered all over the ground. The soil exuded a pungent stench. The blood flow was exhausted, the rivers were dry, and the earth was dead and lifeless.