 If you liked
Uchuu no Stellvia
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 ...then you might like
Mugen no Ryvius
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Stellvia represents another solar system wide destructive event, and another group of girls and boys are asked to defend their lives in a never declared war against unknown enemies. Both are set on a peaceful Space Academy, quickly transformed forcedly into a military outpost.
Other similarities follows: an hidden and powerful secret weapon driven by students, background political intrigues, and the continuous fluctuation from individual competition to group cooperation strengthened by critical times.