I read this manga a long time ago, but forgot what it was called. I remember that the main character had like two spirits or helpers he could summon. One was a fox-girl who had anger issues. I don't remember what the other one was.
He had an ability where he had a separate world with villagers. In that world, they couldn't see him, but they worship him as a God. And then he meets this knight. She was a guard of a princess from a kingdom and was about to be sold as a slave. He saves them and transports them into his world and then brings the slave trader to his world. There's no magic in that world, so the villagers beat him up, then he sends him back. The princess of that kingdom asks him to marry her, or to be the queen of the place.