The romantic comedy "One Night Only" explores a unique premise: a single night each year when premarital sex is legal. The film, set in New York City, centers on Owen, a pizza joint owner, and Allie, a singer.
Owen's girlfriend informs him on this special night that she wishes to use the opportunity to sleep with someone else, leaving Owen disheartened. Simultaneously, Allie's plans for the evening fall through when her friend, Jacinta, departs after meeting a prince. Allie's roommate, who notes the city's LGBTQ+ community has largely disregarded such laws, encourages Allie to make the most of her free night. Dressed in a striking green sequined dress, Allie ventures out.
Owen, also seeking his own romantic encounter, meets Allie. They navigate the city, which has transformed into a landscape of individuals pursuing brief connections on this singular night. The film uses its "preposterous premise," as described by TIME, to develop into a "delightful romantic comedy."