 If you liked
Alien 9
|
 ...then you might like
Washio Sumi wa Yuusha de Aru
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Similar premise: a group of three girls have been selected to defend humanity against monstrous enemies using the help of special powers (powers from the Shinju in WSwYdA, and symbiotic aliens in Alien Nine). Washio Sumi and her friends must defeat the Vertexes, and the girls from Alien Nine must defeat other aliens that pose threats. However, these powers come at a price, and the girls go through traumatic experiences that change them.