Lucía, an adolescent who studies at a Catholic school for girls, is at the stage of her life where all her classmates are changing except her. At an inopportune moment her menstruation arrives, Lucia full of fear and questions is condemned by the people around her who judge her for the changes in her body.
Two elderly women rent a room in their home to a tenant who they suspect is a supernatural creature; this marks the begging of a series of tasks they must do in order to protect themselves from this vampire.
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