“One Night Only” is a high-concept romantic comedy set in New York City where premarital sex is prohibited except for a single 12-hour window once a year. The film follows Allie (Monica Barbaro) and Owen (Callum Turner) as they pursue romance and physical connection during that limited period, with the story framed by a broader, dystopian social rule. Multiple reviews describe the premise as a deliberately constructed “rules of the game” scenario: audiences see characters navigating urgency, desire, and timing as the annual window approaches. The New York Times characterizes it as a “12-hour sexual reprieve,” while other outlets focus on how the film balances (or struggles to balance) genre conventions with its restrictive setup. All sources credit the central pairing’s screen chemistry, with reviewers noting their ability to spark engagement even when the script feels contrived or when the film’s playful tone doesn’t fully align with the weight of its concept. The cast beyond the leads is also noted, including Maya Hawke, Molly Ringwald, LeVar Burton, and Julia Fox, who appear in supporting roles.