 If you liked
Risou no Himo Seikatsu
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 ...then you might like
Genjitsu Shugi Yuusha no Oukoku Saikenki
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While Realist hero is a harem, both stories revolve around ruling kingdoms and dealing with both the political and cultural issues of the kingdoms. Realist hero is a more light-heart series compared to Risou, though they both encompass the struggle of middle ages politics.