Saikyou Henkyou Haku ni Hirowaremashita, Kotori (=Akujo?) desu

Sharon, who was framed by her best friend, labeled a villainess, and exiled from the country, somehow transforms into a little bird in the midst of her despair. Before she even has time to figure out what to do, she is attacked by a monster but is rescued and taken in by Zex, the most terrifying Margrave of the neighboring country, which leads to her living as a little bird! “Ah, she’s just too cute.” Despite his intimidating appearance, Zex gently strokes Sharon’s head with a doting expression whenever he is in front of the little bird (= villainess?)… Eventually, after learning about the deep loneliness Zex harbors, Sharon begins to want to stay by his side, but…?

Original Web Novel
Original Web Serialization

https://www.cmoa.jp/title/365377/