Greg got to his feet, he punched the demon closest to him making him fly back onto the others. He looked at her, he couldn't go back to the human world not till someone reincarnated him into the human world. Sure he was killed but humans plenty of times, but that was because he was ordered to. He looked back at the demons "your can to go to the human world, but I can't I have to be summoned by another human on there world. You will have to go there without me."
Greg knew it was simple logic, he blasted a few more demons away. That's why there weren't many demons on the human surface, they had to be summoned in order to be on the humans world. Most humans didn't even know how to summon demons any more. That's why there were so many of them down here, because they thought summoning a demon was impossible because of there stupid science. Of course there science was stupid because you could summon a demon, they didn't believe that of course so he was stuck down here most of the time.