This is Halloween from The Nightmare Before Christmas in Japanese.
Children walking alone at night may encounter a woman wearing a surgical mask, this is not an unusual sight in Japan as people wear them to protect others from their colds or sickness. The woman will stop the child and ask, ‘Am I beautiful?’. If the child answers no, they are killed with a pair of scissors which the woman carries. If they answer yes, the woman pulls away the mask, revealing her mouth is slit from ear to ear and asks ‘How about now?’. If the child answers no, he will be cut in half. If he answers yes, then she will slit his mouth like hers.