 If you liked
Sora wa Akai Kawa no Hotori
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 ...then you might like
Sarasah
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Both are modern girls in a historical time period, Sarasah is about girl who went back in time to be with the past life of the one she loves (her past life is a daughter of a noble and she disguises herself as a boy to be with the one she likes) and Red River is a girl abducted to be a a sacrifice to kill the royal family (stuff happens, she gets involved, she and Prince Kail fall in love and she is a awesome heroine)