 If you liked
Owari no Seraph
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 ...then you might like
Chaos Dragon: Sekiryuu Seneki
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They both had a character that made a contract. The monster/demon is a weapon. Both main characters have a goal they promised them self to do.
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Recommended by weirdotakonekoo
Both anime are set in a futuristic age and both of the main characters experience a loss that drives them to act as they do. Both anime have themes of action and fantasy and a main character full of determination. Whilst watching Chaos Dragon I was heavily reminded of ONS.