Isekai Tensei shitara, Oshi no Tekiyaku no Maid ni Narimashita

Mikako has cleared the route of her favorite Otome game for her most favorite character, Aaron. She is moved to tears when she thinks of how many times she had been interrupted by Claude Langlois, Aaron's antagonist, and how hard she worked to clear the game. Filled with a sense of accomplishment, Mikako falls into a deep sleep before she knows it. When she wakes up, she is in the world of the Otome game she had just played, and she has been reborn as a maid of the hated Langlois family...!

(Source: Tappytoon)