 If you liked
Gunparade March: Arata Naru Kougunka
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 ...then you might like
Shirogane no Ishi: Argevollen
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Both of these anime have mecha in in but that is not the main focus. You wont see huge battles that last 20 minutes or finale battle where the mecha fight to the death. It is way more of story line driven the people seem more real like you see in real life. These don't glorify war and focuses on the metal aspect of these characters, if you want high pace fighting this not for you.