In a desperate bid to rescue their crumbling nine-year marriage, a deeply fractured young couple, Diego and Alba, travel to a remote, idyllic resort on the volcanic island of Lanzarote. Their relationship has reached a toxic standstill—devoid of physical intimacy, plagued by continuous screaming matches, and thoroughly damaged by past extramarital affairs on both sides. While Diego is fiercely determined to fight for a fresh start, Alba remains entirely detached and closed off. Their volatile energy immediately infects their hosts, Irene and Ben, an older engaged couple whose own seemingly peaceful stability begins to fracture upon their guests' arrival. When a simple magazine marriage quiz forces all four individuals to confront their hidden realities, an explosion of repressed resentment, jealousy, and bitter truths unspools, systematically dismantling both relationships in a paradise that has turned into an emotional pressure cooker.