Mob Douzen No Akuyaku Reijou Wa Dansou Shite Kouryaku Taishou No Za O Nerau summary:

「That's right. I can become a potential love interest as well.」A ray of inspiration strikes, in an otome game where men are treated favorably, the side-villainess starts a crossdressing revolution!?The world is unfair. Just because I am an extra villainess, I'm doomed to always face the bad ending... If that's the case, can't I just dress up as a man and capture the heart of the game's heroine by becoming a potential love interest and live happily ever after?The fiancé with the temper of a kid; the tsundere classmate; the puppy-like brother-in-law; and the beautiful icy-hearted prince, they are all my rivals. Just wait and watch, you handsome heartthrobs! I, Elizabeth Burton, will become a seductive knight who'd softly whisper love and capture the hearts of maidens with a mischievous wink! A heartwarming school romance comedy, where a crossdressing lady aims to become a noble and a fabulous love interest, begins!