 If you liked
Ookami to Koushinryou
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 ...then you might like
Kusuriya no Hitorigoto
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Both light novels with historical and medieval settings (Kusuriya in Imperial China and Spice and Wolf more similar to Europe).
Smart, sharp-witted female main character with a romantic (if slow) story.
And while Spice and Wolf mainly deals with trade and economics and Kusuriya with medicine in the imperial court, both works offer a highly detailed landscape of their worlds, at every scale.