 If you liked
Kidou Senshi Gundam Unicorn
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 ...then you might like
Code Geass: Boukoku no Akito 1 - Yokuryuu wa Maiorita
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Mecha in 3D graphics, both are part of their respective universe which is kind of similar, has male lead and female lead, both Alexander and Unicorn has same colors, released in the same way each year, epic fights when it comes to mecha, and both animation are brilliant!