Demon King Ultimate

The Abyss is home to many creatures but especially demons. Follow the adventures of a group of them trying to survive in this harsh universe. (Yeah, I already know what some of you might say. "But author-san you copying another novel." Well yes BUT no. True I'm using the same universe and "system" BUT this universe is humongously huge so I can IF I don't use at least the same worlds in the same time as the other book [the Darksider world before the 1, so the 2 and 3, for example]. For those who don't know what I'm talking about go read Custom Made Demon Lord, an excellent novel in my opinion).