[Yuume's going to have this exact response when magical girls come up, rather frankly.

But...hm.] Not too common? They're certainly not unheard of, but I've only rarely encountered them...typically they're broken either by countering the force of will and magic with something directly opposite, or simply by taking down the one- or the thing- which created the curse. ...In the case of a person, one could of course talk to them but...