[Aldo Baglio], [Giovanni Storti], and [Giacomo Poretti] are three very different fathers from Milan. [Aldo Baglio] is a seemingly lazy hypochondriac who is always on sick leave, married to Carmen, and a father to three children. [Giovanni Storti] is a meticulous and irritating perfectionist, married to Paola Storti with a teenage daughter Alessia Storti, and he runs a faltering family-owned shoe-accessory shop. [Giacomo Poretti] is a work-obsessed dentist, married to Barbara, and stepfather to twelve-year-old Ludovico, who often withdraws into video games.
The three families travel to a southern Italian island for their summer holidays, only to discover they accidentally rented the same house. The local carabiniere advises them to share the home rather than start a bureaucratic battle, and the tension eases a bit. The agency later offers an alternative, but Salvo, Salvo Aldo’s son infatuated with Alessia, rejects it without telling anyone. The island scene begins to blur the lines between mishap and fate as each family tries to find its footing in this unlikely coexistence.
As the vacation unfolds, each family’s hidden problems surface. Giacomo is secretly coping with a lawsuit he has just lost after injuring a patient. Giovanni has decided to close his shop without informing his family and disapproves of Alessia's relationship with Salvo. Aldo, who seems carefree, is under pressure from Carmen, who fears he is hiding something from her. The shared space forces confessions and small compromises, revealing how fragile the façade of calm summer life can be.
Forced to live together, the three men gradually bond. They search for Aldo’s lost dog and later chase after Ludovico, who has run away to meet a pen pal in Follonica. In that seaside town, [Giacomo Poretti] helps bridge the gap with Ludovico, who decides to stay a bit longer with the pen pal’s family. The experience softens the sharp edges each man wears at home, and a surprising camaraderie begins to form among the fathers.
Meanwhile, their wives also grow close and indulge in carefree moments, while Salvo and Alessia’s relationship deepens against the backdrop of sun and sea. On the return trip, the group stops in Santa Marinella for a concert by Massimo Ranieri. Thanks to an old favor, Giacomo gets Aldo onstage to sing with his idol, a moment that fulfills Aldo’s lifelong dream and creates a shared memory for all.
Back on the road, Aldo falls ill and is hospitalized. The truth he has kept hidden is finally revealed: he has a terminal disease and asked to spend his remaining time in joy, simplicity, and ordinary moments with the people he loves. In the end, the three families—now closer than ever—return to the island to watch the summer fireworks together. Aldo’s voice-over closes the story with a paradoxical line: he hates summer, but only when it ends.
