Total Recommendations: 2
If you liked
Senjou no Valkyria
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...then you might like
Toaru Hikuushi e no Koiuta
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While Toaru Hikuushi e no Koiuta takes place in the air and on airship looking things, Senjou no Valkyria: Gallian Chronicles takes place on the land, and with tanks and guns. Both have a romance built around the core plot of action, duty, and major character build up.
If you liked
Giniro no Kami no Agito
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...then you might like
Neppuu Kairiku Bushi Road
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Drastic event changes the world as we know it - in this case it's killer plants - and years later the story follows someone who's fate is to undo what evil has been done. Both have action packed moments, moments of touchy-feely love, and monsters (because who doesn't like those).