 If you liked
Soukyuu no Fafner: Dead Aggressor
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 ...then you might like
Aldnoah.Zero
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Combining elements of advanced technology (mecha) and sci-fi themes, both of these series involving an invasion to a planet where the main characters fights back as resistance. The main male protagonist becomes a driving force as he takes charge on dealing with the invaders alongside others. There is a state of warfare as humanity/earthlings fight for survival. At the same time, there are also mysteries regarding the origins of the mecha and characters. Recommended for anyone into sci-fi/mecha with warfare themes.