I read a book (it was definitely a comic, possibly manga) about a girl whose parents die and she goes to live with her auntie and uncle. They are actually vampires (or witches). Her cousin is mean to her and the girl wants to leave but is convinced by her uncle to stay.
I know it's a vague description but it is all I remember. I loved reading it but I have no idea where my book actually went all those years ago.