Akuyaku Reijou nano de Last Boss o Katte Mimashita

Avoid the bad ending at all costs! When her fiancé breaks up with her in front of the entire student body, noblewoman Aileen Dautriche is devastated—or she would have been, if that wasn`t also the exact moment memories of her past life came crashing back! Turns out, she`s been reborn as the villainess of a dating sim...and according to the story, she`s slated to die at the hands of the demon king ...