 If you liked
Romeo x Juliet
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 ...then you might like
Shingeki no Bahamut: Virgin Soul
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If you enjoy fantasy romance with action than these anime will entertain you: Both are stories where a faction/race plans to overthrow a cruel regime where the ruler/king is a tyrant. You have a forbidden love as a central theme and mythology of divine beings and also, in both the fate of the world is in danger, as the world faces an imminent destruction.