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One night, María and Francisco begin living together. Seeing no food in the refrigerator, Francisco decides to buy a special meal. During this time, María is left alone, sorting through her belongings in the apartment. She feels watched by someone who doesn't see her. She finds her old scrapbook containing her imaginary friend, the Tooth Fairy, and sees several photographs and drawings she doesn't remember seeing. In fact, when she gets rid of the scrapbook, a huge humanoid creature stalks her. María reaches a fever pitch where the creature will drive her mad until it ends her life.