Devil in Devils son in-law

Nova Wakes up to find himself in a world from a story he read, Devils son in-law. a world for the strong, only power matters. if your weak you will get used up and left for dead, before he gets the chance to worry though he thankfully gets a system. A DxD system in a demonic world, Nova beings his own story with knowledge of future events and aims to survive the approaching end times.