David goes to a Billis party for the first time. But the party gets out of control when a conflict arises against Los Bárbaros, Los Billis’ declared enemies.

To prove his loyalty to the gang, el Indio asks David to sell marijuana at the school he goes to. Anxious about getting caught and expelled, David tries a joint for the first time and Andrea helps him go through the bad trip.

David is finally a member of Los Billis, and he receives an invite from Mariana, the school’s coolest girl, to her birthday party. Persuaded by Leo, David thinks that this might be his chance to have sex for the first time.

While David is heartbroken, el Indio invites Los Billis to celebrate his new adult life at a bar, and Andrea learns about her boyfriend’s dark side.

David deals with his parents’ divorce and the approaching move to a different neighborhood, while el Indio is squandering his money and living without limits. His excesses earn him a new enemy: the police.

Los Billis attend an intercollegiate band contest to support Andrea, while she debates whether or not she should confess her feelings to David. El Indio, feeling powerful for his success in micro-trafficking and his uncontrolled use of drugs, is about to face his greatest enemy.

Los Billis, worried about the disappearance of el Indio, begin to search for him everywhere. During their search they learn that el Indio had more enemies than they could have imagined.