Friends are alarmed when high school student Bel is stricken with a mysterious illness after a wild night of dancing, drugs, and kissing.

As Bel's condition worsens, her friends track everyone who kissed at the party; Chico and Alex seek out secret romances; Fran worries about her mum's health.

Controversy erupts over the burial; a kissing map goes viral on social media, rocking the community as more students develop symptoms.

Fran grows weak in the hospital; Alex and Chico attempt to solve the mystery of Manu's whereabouts, and get to the truth about another rave in the forest.

Progresso's young people become more rebellious; Chico and Alex try to save Fran by bringing her to the village; Alex discovers a dark family secret.

A video of Chico spreads, leading to a brutal attack; Alex exposes the origin of the disease; parents unite to cure their children.