In this adventure Nacho tries to rescue Black Dog during a school field trip that makes him face his own insecurities. He won’t be alone. La Llorona, who is in reality the guardian of the river, will help him with the magic of a powerful tear that attracts storms and makes even the most self-controlled person very emotional.

A reinterpretation of the traditional Latin American folklore of demons and monsters in which La Llorona is an ally of the protagonist.