 If you liked
Rikujou Bouei-tai Mao-chan
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 ...then you might like
Alien 9
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Alien Nine has the same theme of grade-schoolers capturing aliens but with a more serious and slightly darker storyline.
Mao-chan is like a more light-hearted version of Alien 9. A group of 3 schoolgirls are part of a special military effort tasked with defeating aliens which routinely crash into the surface of Japan from space. The girls use alien weapons to fight which give them powers similar to magical girls.