 If you liked
Koushaku Reijou no Tashinami
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 ...then you might like
Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
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If you enjoy LN's with a heroine from the present world that reincarnated into a rival of the heroine of an otome game and has several males as her companions, then you might like to read these. They both feature the heroine which is of noble birth: the daughter of a duke and she remembers her past life.