Robin is known as "the eighth son of the Muds" even though she is a girl. Like her brothers before her, she is rough, rowdy and indistinguishable by the layers of gray mud caked onto her skin and hair. But at night, when everyone else is sleeping, she dances. Since none, but the nobles dance, it is with this secret passion that Robin becomes envious of her older brother and the fact that he's allowed to attend the Royal Academy simply because he is a seventh-son.
So, what does she do?
She picks up any old alley cat from the streets and tries to sneak in, of course.