Bump idea 3: Souls
Genre: Fantasy
Two fairly normal people find that the afterlife is not as simple as they have been told. Their spirits are trapped in a ghostly fantasy realm and they are told that there is a quest they must finish before they are allowed to see what final destination of all spirits. This idea would allow for us to fight various other spirits we run into who we may be at odds with, since it's incredibly rare that the quest is ever finished and most of the souls remain trapped forever struggling to achieve their heroic destiny.
It says fantasy be could be modern souls trapped in a fantasy world if we like. Or one of us could be a grizzled veteran of the afterlife and the other from modern times. There is a lot of wiggle room here.