 If you liked
Sora wa Akai Kawa no Hotori
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 ...then you might like
Pharaoh no Haka
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Historical shoujo taking place in similar times and settings, Pharaoh no Haka and Red River are notable for being historically accurate without seeming like history lessons. They're both epic adventure series, but with a distinct shoujo spin, and beautifully divide their focuses between their overarching plots and copious character development.