Before her death, a grandmother gives her granddaughter a magical ring that'll give her dead spirit power over her. The spirit manifests itself when her head detaches from her body at night and flies away with guts dangling under it, seeking blood to drink or raw flesh to devour.
There are no walls that can separate love between a man and a woman, but there are some parents who don't understand, even though those parents have themselves been through the same feelings in their youth. To stop their children from loving is like pushing them to be more rebellious.