I Won't Become Cinderella

Taken in by the duke's family after her parents' death, Shirley is greeted by two older sisters and a stepmother. What appears at first glance to be bullying is actually tsundere behavior! Though their faces are scary and their words are harsh, these people are actually really good people!? Convinced of this, Shirley studies hard so as not to embarrass herself as a duke's daughter. But then, the second prince who is her sister Myrtle's fiancé suddenly starts getting close to her...!? Furthermore, what is the reason the duke is so rarely able to meet her? A slapstick comedy with a strangely dramatic duke's family in the midst of a girls' manga.