The True Heiress Is an All-Powerful Bigshot

A highly skilled fighter wakes up in someone else's body and discovers that she's the Huffmans' lost daughter - Gemma, a human blood bag for her Aunt Elodie, and regarded as socially inferior to her adoptive sister. Her father doesn't care about her. Her mother is ashamed of her. Just when everyone thinks she's going to make a complete fool of herself, they get a slap in the face.