I'm the Villainess, So I'm Taming the Final Boss, Vol. 3 (Manga) - Mai Murasaki

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?