In a near-future New York City, everyone receives a call on their eighteenth birthday—if they're going to die that day. Mateo and Rufus, two strangers, match on an app designed to help the doomed spend their final hours with someone. One is a sheltered, anxious teenager escaping his overprotective mother for the first time. The other is a bold, grieving young man haunted by loss. As they navigate the city together, they form an unexpected bond, sharing dreams, fears, and stolen moments of joy. Racing against the clock, they discover that life's meaning isn't measured in years—it's measured in connection. Their one perfect day becomes a meditation on mortality, love, and what it means to truly live when time runs out.