 If you liked
Haken no Kouki Altina
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 ...then you might like
Nejimaki Seirei Senki: Tenkyou no Alderamin
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Both series takes place in a fantasy world where there's war and political affairs that divides nations. In addition, the female protagonist from both series share some similarities. There is strategy involved in many of the military conflicts and throughout both series, we see how characters take risks and plans their moves to get advantages. There is also romance although the pacing is rather slow in their story.