 If you liked
Sora wa Akai Kawa no Hotori
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 ...then you might like
Crazy Girl Shin Bia-Ah
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Different stories, but in both a modern girl ends up in the past, but the two behave very differently
Both girls are sent back in time, have people who wants to kill them, too many men who wants their love and scheming evil women surrounding them. They're both strong individuals who adjust to their new surroundings and fight to win. Both stories left me with a feeling of just having read a masterpiece, which I rarely feel.
Modern day girl slips in time to historical period, proceeds to capture some bishounen hearts.