Apparantly this text isn't widely available, and it's interesting, so here it is. It's a snippet from the PSIV manual where it explains the game's setting.
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THE HUNTER'S QUEST
Two thousand years ago, in the Algol solar system, there was a war fit to end all wars. The civilization that emerged from the wreckage flourished and prospered, until the fateful day when Mother Brain --the central computer system on the planet of Palma-- exploded. Palma was destroyed, initiating the slow destruction of the same worlds that Mother Brain was built to protect. The ancient maintenance Bio-systems, which were built with the last great technological knowledge not lost in the war, began to break down. Their malfunctions released terrible monsters upon the worlds the systems were built to maintain and protect.
A caste of warriors known as Hunters emerged. They were mercenaries who specialized in exterminating the Bio-Monsters that plagued the simple cities and villages.
Our story begins on the world of Motavia, over two thousand years after the Great War. A young Hunter named Chaz is about to embark on his first assignment. He doesn't know it yet, but his adventure will take him beyond Motavia, and beyond history itself.