 If you liked
Hana to Akuma
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 ...then you might like
Kuro Hakushaku wa Hoshi wo Mederu
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If you liked the historical / supernatural setting of Hana to Akuma you may like Kuro Hakushaku wa Hoshi wo Mederu. These shoujo romances have a marriage between a person with supernatural origins and a human. In this newer manga it is the reverse and the girl has the abilities and the Count is human while in Hana to Akuma the nobleman is a demon. This one does not have a big age gap like Hana to Akuma so there are differences but they are both fun supernatural romances.