Danshi Koukousei, Otome Game no Akuyaku Reijou ni Tensei suru.

男子高校生、乙女ゲームの悪役令嬢に転生する。

The manga's story centers on a very ordinary high school boy who gets reincarnated as the villainess in an otome game. Now he has to avoid getting ruined while trying to get along well with the heroine at the same time. (Source: ANN)