From the introduction:
You've likely seen a hundred worlds that look just like this one on initial inspection. Indeed the template for this world is possibly as generic as can be, for just about any world could technically fit the bill. This world could be anything from a mundane modern world, to a fantastical fantasyland, to steampunk future-tech dystopia, and everything in-between. What makes this world different from the others is something that occurs on a much smaller scale. Spread throughout the world are a selection of individuals around which a very specific type of phenomena occurs. For ease of reference, they can be called the TSF-ers. These individuals will find themselves in circumstances where they or people around them are transformed, changed, or swapped around by people and forces beyond their control. More often than not, these events involve a change of gender and body.