Maou-sama, Retry!

As Akira Oono shuts down the servers of Infinity Game after fifteen years, he suddenly awakens in a strange world inside the body of his own character, Demon Lord Hakuto Kunai. His overwhelming abilities and equipment have followed him, but the people and monsters around him are not part of any world he remembers creating. After rescuing a young girl named Aku from a demon, Hakuto takes her along while searching for an explanation. Saints, nations, and hostile forces soon react to the terrifying Demon Lord in their midst, leaving Akira to navigate a world that fears his power while he privately has little idea why he is there.