 If you liked
Kurogane no Linebarrels
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 ...then you might like
Ginga Kikoutai Majestic Prince
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In both series, the themes of mecha action comes into play involving the many characters of the series. The main characters are in fact students from an academy.
Both series features the usage of mecha warfare where the pilots are also identified as being special. In particular, the main character from both series seems to hold special origins.
There is comedy, drama, and action involved in both series that also incorporates the science fiction theme.