The film begins in the unforgiving streets of Mexico, where Octavio, a young man, is racing frantically with his friend Jorge. In the backseat is Octavio's beloved rottweiler, Cofi, who is badly injured and bleeding. As they try to escape from some hostile thugs in a yellow truck, tension mounts; Octavio is not only desperate to save Cofi but also to evade his pursuers. Despite their efforts, their car eventually crashes at an intersection, a pivotal moment that sets off a chain of events shaping the rest of the story.
The narrative then shifts back a few days, introducing us to a punk named Jarocho, who is seen cruelly entering his dog into brutal back alley dogfights organized by a hefty thug known as "Fatso." After Jarocho's dog wins a bloody battle, earning him a quick 20,000 pesos, he foolishly lets his winning dog loose on other strays. But he is interrupted by El Chivo, a vagrant who brandishes a machete, ultimately driving Jarocho away. Unbeknownst to them, Jarocho later comes across Cofi wandering the streets and decides to pit his dog against him.
Meanwhile, Octavio lives with his family in a dilapidated home. He harbors a secret love for his brother Ramiro's wife, Susana, yet harbors resentment for Ramiro, who is abusive and unfaithful. Ramiro struggles with money, often resorting to robbing convenience stores to make ends meet, which leaves Susana feeling frustrated and desperate. When Jorge comes to inform Octavio that Cofi killed Jarocho's dog, it triggers a rise in tension. Jarocho confronts Octavio, demanding compensation or access to Cofi, but Octavio stands his ground, and this encounter ignites Octavio's plan to enter Cofi into dogfights to win back the cash he desperately needs.
From there, the conflicts escalate as Octavio enlists Cofi to fight and rake in substantial winnings. His desires grow; he tries to persuade Susana to escape with him and start anew, but she rebuffs him, revealing a new pregnancy that worries Octavio, as she fears Ramiro's rage. As Octavio increasingly entangles himself in the dangerous world of dogfighting, he engages in a complex relationship with Susana, leading to secrecy, lies, and ultimately betrayal from Ramiro, who senses the changes and demands his cut of the profits.
A pivotal moment arises when Octavio agrees to a private fight against Jarocho's Class-A fighting dog for a massive 40,000 pesos. He hopes this will be his big break, but he soon learns of Ramiro's connection to Susana and the true nature of his brother's greed. As the tension reaches a boiling point, Octavio's desperation leads to violence and a series of shocking events, culminating in betrayal and the tragic loss of those closest to him.
This intertwining narrative threads into the life of Valeria, a model struggling with her newfound fame. After an accident involving Octavio, her world spirals into turmoil as she deals with a severe injury and the complications in her relationship with her older boyfriend, Daniel. Their lack of communication and escalating frustration lead to dire consequences, reflecting the intricate tapestry of relationships marred by neglect and desperation.
Finally, we delve into the tale of El Chivo, a disillusioned former professor turned hitman. His complex backstory reveals a man haunted by the choices that led him to estrangement from his family. As Chivo navigates the streets, a hit assignment unexpectedly intersects with Octavio's story, and he finds himself nurturing a bond with Cofi in a moment of unexpected compassion. Chivo struggles between his violent past as a killer and his yearning to reconnect with a daughter who believes him to be long gone.
As the climax approaches, the fates of Octavio, Valeria, and El Chivo intertwine, leading to a profound exploration of love, loss, and redemption against the backdrop of a city that feeds on the struggles of its inhabitants. In their destinies, we see the deep scars left behind by violence and regret, painting a heart-wrenching picture of life and survival in an unforgiving world.
