Starting from the Ruins: I Became the Devil

Faet, the first heir to the Demon King's City, was awakened. The good news is that the previous generation of brave men and the old devil king died together, and no one can care about me. The bad news is that he is not Faet's original soul at all, but a modern person reincarnated in the body of the Demon King. Fortunately, the various kingdoms outside are still competing for the legacy of the previous demon king. Looking at the group of defeated generals in front of them who are eagerly waiting to lead them back to glory. Wait... What if I can build this ruins from scratch into the Demon King's Castle that covers the sky with one hand? When the various kingdoms were re-carving up the heritage of the old continent, when they came to their senses again, they discovered that the elite troops of the demons had returned. They call this "The Miracle of the New Devil."