 If you liked
Blue Gender
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 ...then you might like
Kikou Souseiki Mospeada
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Both series involve a small group traveling a great distance in order to get to a specific point on the globe inconveniently far from where they started while fighting an alien species that has dominated humanity. This changes halfway through Blue Gender as the focus shifts a bit, but the alien presence on Earth is still unwelcome. Blue Gender is the darker of the two series, but if you enjoyed the traveling a great distance while fighting things that want to kill you aspect, you should consider giving the other one a shot.