 If you liked
Nishi no Yoki Majo: Astraea Testament
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 ...then you might like
Soredemo Sekai wa Utsukushii
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Both of these series revolve around royalty. Both have strong female leads and male leads that are somewhat standoffish but love the female leads deeply. Both series contain magic of different sorts and involve lots of political intrigue. Overall, if you like one you should at least look at the other. Romance is a big part of both series.