Ecological comedy about two brothers. Alejandro and Guillermo are two Asturian brothers lovers of Nature since they were children. Alejandro is a renowned zoologist who investigates wildlife and lives in the trees like an animal. Guillermo is an internationally renowned biologist, who has received numerous awards. One day he discovers a green sprout in Antarctica and, convinced that the battle is lost, leaves everything and goes back to Asturias. Once there, he looks for his brother Alejandro in the forest where they live. Since the arrival of Guillermo to the forest, the sentimental ecosystems of the characters will be altered.

Cundo regresa a su tierra después de diez años de ausencia. El motivo es la muerte de su mejor amigo, Suso. Los planes de Cundo son emborracharse con el resto de sus viejos amigos a la salud de Suso, aparentar que todo le va de maravilla y salir corriendo de allí otra vez. Pero ni las cosas le van tan bien, ni Suso se va a conformar con una borrachera.