Demon Lord, Retry!

Story:

What do you do when the 15-year-old MMO you've been running ends? Akira Ono had no option because he awoke in the body of the Demon Lord, his in-game character, stuck in the realm of his own game. He makes every effort to survive the harsh fantasy world of his own design, prosecution by the good guys, and, of course, the final boss. He has an outcast youngster as his sidekick.