 If you liked
Sora wa Akai Kawa no Hotori
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 ...then you might like
Vampire Game
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The plot lines are different, but both are excellent epic stories taking place at court, among magic in a world/time period different from ours. In both cases, female characters are strong and charismatic. RR is more shojo-based, while VG has more of an adventure feel to it, but both are excellent reads!