I'm the villainess, so I'm taming the final boss

Avoid the bad ending at all costs! When her fiancé breaks up with her in front of the entire student body, noblewoman Aileen d'Autriche 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 in three months! But Aileen's already got a plan:...

"It's the final countdown to the end of the game and Lilia's determined to get things back on track--but while a happy ending may be at stake for the heroine, it's a matter of life and death for the villainess! Will the powers and schemes of the Maid of the Sacred Sword prove too much for Aileen, or will she be able to emerge victorious?" -- back of cover.