Risu ni Natteshimatta Konyakusha ga, Kegirai shiteita Hazu no Watashi ni Tasuke wo Motometekimashita.

Amelia, the daughter of a countess, has been abused by her family and is disliked by her fiancé, Cedric, who sees her as unsociable. Amelia lives a life supported by her beloved job as a pharmacist, but one day, someone comes to visit... Cedric, who has been poisoned by someone and turned into a squirrel!? "Please let me stay in this room," Amelia pleads. Thus begins her strange cohabitation with her fluffy fiancé (the squirrel)! (Source: Kadokawa, translated)