 If you liked
Risou no Himo Seikatsu
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 ...then you might like
Isekai Kenkokuki
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Both titles are "irregular" isekai stories that have a lot of delicate diplomacy and politics with a dash of romance.
The power balances between the characters are well kept. The MCs do not have "gifts" that allows them to brute force through predicaments but rather rely on knowledge and negotiations to solve their problems.