Well, it worked out in the end.
I would have wanted this to be serialized, with the magical girl's age being bit younger (not talking about her looks, she's perfect as is).
While Rua needs to be taken down a peg or two, her grandfather, who is the chairman of the school, needs to be punched in the face hard for enabling her to the point that she's completely out of control. This isn't doting on your granddaughter, you're just creating a 'monster' that doesn't have...