In the past few days Rome has been the scene of a singular event: when it rains, the manholes exhale a dense steam whose origin and composition is unknown. No one can imagine that whoever breathes in the mysterious substance will have to deal with what he/she represses, their darkest instincts, their anger. Not even the Morel family.

PE teacher Sergio is assigned to Remis, a small mountain village where the people live with unshakeable serenity, but soon discovers that behind the peace lies a disturbing ritual. Once a week, the locals are freed of their pain by "holy boy" Matteo, a 15-year-old introvert with the power to heal one's soul just by hugging them. Trying to rescue Matteo from this madness, Sergio unleashes his dark side.