 If you liked
Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
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 ...then you might like
Tensei shite Yandere Kouryaku Taishou Chara to Shujuu Kankei ni Natta Kekka
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Similar premise where the girl is reincarnated as the main villainess of the otome game. In both manga MC decides to be nice to others and help them. MC also meets her love interest/s in her childhood, while the otome game story starts to unravel in a school. While in Otome game MC has multiple love interests, in Tensei Shite Yandere MC has only one main love interest.