Fat to skinny

Cute chubby girl will goal to lose weight as she was reborn as a villian from an otome game an know she wants to lose weight cuz she wants to save herself from being executed

Reborn as a villian in an otome game
She is good even when she is trying to be bad
Loses weight
Sweet and cute romance

Female lead is a fujoshi, one of her favourite anime characters (shion) dies so she stays in bed for a week without eating or drinking - shalalaboom she magically loses weight