::EDIT nope dont think there was for xenogears::
a story intro, eh tau? ok, ill take that as an assignment.
In the distant future, Humanity has expanded it's grasp into the far reaches of space. Many colonies exist, and many planets have been populated, as well.
However, space has many threats within it. among these threats are the Gnosis, creatures of unknown origin that do not abide by the rules of reality. Seemingly unstoppable, these ghost-like beings ravage any unfortunate enough to cross their paths. The agenda of the Gnosis is unknown to civilized man. All that is known about these hostile creatures is that they cannot be killed, for they exist in another dimension.
Yet not all hope is lost. Humanitys last stand falls on the shoulders of a small group of researchers. They are to create the ultimate weapon against the gnosis. Project name: KOSMOS.
An android is created by these researchers. This androids name is KOSMOS. The lead researcher, Shion, treats KOSMOS as a living person, but, as she soon finds out, KOSMOS is NOT alive. She is but an android, nothing more.
In this world exist an engineered race known as the Realians (Ree al ee uns). Born to die, they exist only to fight for their masters. To deny the battlefeild is to deny their own existence. Genetically engineered killing machines. This is the Realian.
The humans have also devoloped advanced humanoid machines for hand to hand combat, the AGWS unit. Also capableof weilding guns, the AGWS units are dangerous indeed. A human is required to pilot these machines, however.
Even as the AGWS fall powerless before the onslaught of the Gnosis, They are not undefeatable. The Hilbert Effect, which brings the Gnosis to fight in our dimension, makes them vulnerable. However, this technology is still in its testing stage.
In this bleak and desolate universe, one chance remains for humanity. But remember, every rose has its thorn...

189. The Moral Of The Story (Ghaleon Rule)
Every problem in the universe can be solved by finding the right long-haired prettyboy and beating the crap out of him.
We do NOT fire on angels , son.