It's 2008. Malena, 22, leads a lonesome routine in a city far from her home until a news story reconnects her to a traumatic past. In 2004, she attended a rock concert at the República de Cromañón venue. A fire broke out, killing 194 young people. The news confronts her with the guilt she feels for having survived and propels her to make a decision that will change her life.

It's 2008. Malena faces the difficult decision of testifying in the Cromañón trial and reconnects with an important object she had lost during the concert. The emotional shock triggers memories from the days before the fire. In 2004, she auditions as a guitarist for Los Peces Chinos — her neighborhood friends' band — and also grapples with guilt over a forbidden kiss.

Malena has an emotional and disturbing encounter, prompting her to open her old backpack. The objects she sees connect her to the first of the three Callejeros concerts, where the tension surrounding a forbidden love is reignited. Meanwhile, Bichito meets Javier, and the first signs of danger begin to emerge at Cromañón.

It's 2008. As Malena reconnects with Villa Celina and its streets, she stumbles upon a mural that brings back memories of the hours before the second Callejeros concert. In 2004, Nico and Lucas get into a fight, Luli receives unexpected news, and Bichito experiences an uncomfortable moment with Javier. Back in the present, an old friend gives Malena revealing information about Nico.

Everyone enjoys their last hours of happiness before the concert on December 30, 2004. Once inside Cromañón, a fire breaks out, killing 194 young people and shattering an entire generation of kids who enjoyed rock music. Additionally, moments before the horror begins, a revelation makes the triangle between Nico, Malena, and Lucas particularly unsettling.