So I just started Muv Luv Alternative. I thought it had no routes and a single ending, but that apparently isn't the case.
It seems there are "arcs", and choices.
1) Is there only one ending?
2) Do I unlock new arcs as the story progresses? How do the "arcs" work?
3) If there is only one ending (I am not sure about this), what do the choices change?
4) Is there a walkthrough, do the choices affect anything?
5) If there isn't a set order, what's the recommended order of reading the arcs?