The Ending. Now the Demon has franchised itself? (spoilers)
So at the end, the protagonist kills herself in an arena full of people. So by the lore established, everybody witnessing is infected. Locked into a contract with the Demon to have their souls tortured.
Does he collect all of their details, compile a to-do list, then work through the list one by one?
Or is he going to franchise himself, McDonald's style?
Now he has to hold interviews with prospective demon employees to cover the thousands of new soul hauntings within the next week.
Hold training sessions with the new starters to get them up to speed on how he runs the business, hand out workflow guides, and step by step instructions so they can meet their quota of one death per 5 days.
Then he gets to kick back as manager and oversee each employee, then watch all the deaths roll in.
Maybe he could pop in for a couple of hours on each to see how they are doing, make sure the possessions are up to his standards, give them pointers and make sure they are on the right track for that one death in 5 days.