If you liked
Busou Shinki
|
...then you might like
Frame Arms Girl
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Practically the same thing, both are based on lines of very similar mecha musume action figures.
If you liked
Rikujou Bouei-tai Mao-chan
|
...then you might like
Vividred Operation
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It's practically the same anime, Mao-chan is just less serious and more focused on overall cuteness. In story: Both are about a group of little girls who transform into marching band style uniforms to fighting off aliens in a city by the ocean with the support of the military. In characters: Mao is similar to Akane, they're both the main characters and they both receive their powers from their grandfather. Aoi and Misora are almost the exact same character, they both already have established friendships with the main characters and are the second to receive their powers. Kagome Mishima and Mizuha Amagi are both women in the military who get assigned to be the school teacher for the main characters.