Full-Time Devil from Another World

When Ender woke up, he found that he had traveled to the magical world and became a demon lord. Unfortunately, he was a lord with no money, no one, and no territory. Ender: "One day, I will go back to my hometown in the devil world!" All in all, this is almost a story about a down-and-out lord who was left behind in the human world and returned to his hometown.