Total Recommendations: 1
If you liked
Owari no Seraph
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...then you might like
Enen no Shouboutai
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Both include brothers fighting in fantasy world using different powers and weapons. Brothers are seperated one for "good" guys and one for "bad" guys and in both series there is seek for reunition and they don't know much about the surrounding world and what mysteries they are fighting against. In owari no seraph they are brothers only formally.