 If you liked
Ginga Kikoutai Majestic Prince
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 ...then you might like
Captain Earth
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Captain Earth and Majestic Prince have similar content in it's story and genre, like a Mecha action, and aliens invading a human planet. The antagonist are mostly an alien species that are invading a human planet with their reasons and the protagonist, mostly a group, or teamwork, will prevent them from conquering the planet. They clash between each other, and have a wide variety of weapon armaments that gives them the upper hand to defeat one another.