A fantastic discovery gets out of hand when artisanal fisherman Nacho and his young nephew Pato accidentally catch a childlike mermaid in their net. Unsure whether to help her, sell her, or release her back into the ocean, the two of them, along with Pato's overprotective mother Magda, must decide what to do when a bit of magic invades their world.

Fonsi is an apparently privileged 12 year old boy. As we get to know his dysfunctional family, his world begins to crumble in a matter of hours. Due to a series of unexpected events, each character changes drastically, facing a crude reality.