|Full Metal Panic! Another Light Novel And Manga Volumes|
So there is this thing called Full Metal Panic! Another. What is it? A spinoff light novel series set in the same universe as FMP, 11 years after the events of the final book in the original Full Metal Panic! light novel series. What is a light novel? It's a style of Japanese novel primarily targeting middle and high school students (as wikipedia would say).
FP!A is written by Naoto Ooguro with some help of Shoji Gatoh, creator and author of FMP. As with the original Full Metal Panic! light novel series, illustrations are done by Shiki Douji.
There has been one known attempt by the Baka-Tsuki Translation Community to fan translate FP!A (the official abbreviation for Full Metal Panic! Another) to english, but so far they didn't live up to their promise.
However, the events of Full Metal Panic! Another are not completely unknown. Over the past years, users of the animesuki FMP! board have gathered a buch of spoilers that should give you a pretty good idea, what FP!A is about and where it's headed.