From the introduction:
You have awoken in a world unfamiliar to you. Though it resembles your home world superficially, there are dark elements at work behind the stage of this place.
There are horrors beyond the perception of mortals that we do not suspect, and once in a while man unknowingly calls them to just within his range. These fiends are at best completely oblivious to man's existence and at worst actively malicious.
Two version of the scenario file are available - they are identical in content except for graphics density (and file size).