 If you liked
Zegapain
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 ...then you might like
Blue Drop: Tenshi-tachi no Gikyoku
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Both of these anime focus on an odd futuristic setting where mechas are used to solve the plot issue. One big tie these two have is the romantic role within the story. Both have mecha fights and sort of political wars while developing the romance between the two love interests. As the story moves forward the romance builds up. The only difference is that Blue Drop is much more tragic than Zegapain