Mob Douzen no Akuyaku Reijou wa Dansou shite Kouryaku Taishou no Za wo Nerau

The world just isn't fair and Elizabeth Burton knows that better than anyone. Reincarnated into an otome game as a two-bit villainess, she's been doomed by the genre's tropes to a life of misery. What's a girl to do... but cross-dress her way into the main character's heart and a guaranteed happy ending of course! After years of blood, sweat, and tears fashioning herself into the perfect heartthrob, all she has to do is wait for the fated first meeting with the main character... or so she thought! As it turns out, her manly charms have come back to bite her in the butt. The other love interests have started cross-dressing too, and they don't want the main character's heart—they want Elizabeth's!

(Source: J-Novel Club)