If you liked
Akagami no Shirayuki-hime
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...then you might like
+C: Sword and Cornett
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Both stories focuses on a 'royal' family member and their friend/parter (in each manga respectively) in a fantasy world where kings, nobles and servants serve as the political structure of this world. +C has more action in it while Shirayuki Hime is obviously more romantic. But after reading both I enjoyed them both immensely and felt a similar feel to it (largely due to the beautiful character designs and art both of these manga contain).
Both are set in fantasy worlds where politics and the governance of the kingdom provide the backdrop for the story. Both are driven by the relationships between people of different classes as well as between the older/younger princes of the country. The art style is also very similar in both manga.