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If you liked Owari no Seraph add

...then you might like Sirius add

Both have similar setting with the protagonist joining an organisation/group to seek for revenge after being saved by a person who the protagonist respects (fatherly-like figure). You would honestly ship the two in the anime together (mikayuu, yukhail). Both has vampires as the antagonist as well. However, the magical element is not brought out as much in Sirius than in ONS.