anyone watching Muv-Luv Alternative Total Eclipse?
It has mecha (as TSFs) fighting aliens (called BETA) and while it hasn't happened yet there's going to be a love triangle
its ongoing and only has 2 eps but I think it's decent so far
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http://kotaku.com/5920417/ why-gundam-extreme-vs-is-the- best-anime+based-game- ever-made