Emilio Mayorga Daniela Leyva at La Mitad del Continente (“The Howls”), Andrea Toca at Mexico’s Un Beso Cine (“Human Animals”) and Diana Bustamante at Burning SAS (“Buy Me a Gun”) have teamed to co-produce the vampire drama “The Day is Long and Dark,” the eighth feature from one of Mexico’s most important directors, Julio Hernández Cordón.“Working with Julio has always been an enthralling experience.