 If you liked
Soukou no Strain
|
 ...then you might like
Aoki Hagane no Arpeggio: Ars Nova
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Soukou no Strain and Aoki Hagane no Arpeggio: Ars Nova contains science fiction themes with a military format related to a war between factions. Both series chronicles an ongoing conflict in a futuristic setting.
Both series' factions at war possesses special technology used to battle their adversaries with a mysterious origins surrounding them. Among other factors, there is action and drama.
The main female protagonist from both series are trained as soldiers and serves as a member in the ongoing conflict.