It's before a thousand years the time when gods and human live in harmony but a war broke out between gods and devils in between human's ware just a mear tool in their hands. War continued for ages many died many become god and devils themselves,so they are known as Demigod and Demidevil they created sancturies (paradise) for their bloodline and followers
After a thousand years a lot has changed the story is about a boy who wanted to create a sancture for his loved ones