The finals of the international Bolaetrapo (Ragball) tournament, a popular street football game, reach their climax when suddenly Bam Bam de la Guerrero, captain of the Mexican team, brutally strikes Nutria, a figure of the Colombian team, and leaves him unconscious. This is how, through an enigmatic narrating voice, a great flashback takes us back in time to delve deeply into the story of Nutria ...