The Chubby Villainess' Restaurant

One day, Naoko is suddenly possessed by the world of a restaurant management otome game, but she has to play the game's hard mode as the hated duchess Fiore. In order to survive the crisis of being expelled from the school, she is put in charge of running the on-campus restaurant, VILLION. Using his pre-possession cooking skills and knowledge of the game, he tackles missions to increase the likability of the characters he is trying to conquer and the popularity of the restaurant. Then, the Dauphin Leonardo's love route with a difficulty level of 5 stars opens up...

(Source: Manga Mirai)