There are eight gates that lead to each level of hell. Over time, demons have used these doorways to enter our world. They've secretly lived on earth as long as humans and they aren't planning on going anywhere. Not all of them are evil. Some just want a second chance, but there are those who want to bring on the chaos.
There is a covert organization created by both humans and demons whose mission it is to keep the peace between both species. A peace that is currently being threatened by a dark force. If the humans are to survive, they are going to need a lot of help.
The Demon Gate Series