Nacho and Lucía celebrate 20 years of marriage and decide to celebrate by embarking on a fabulous sailboat. Before the trip, they are assailed by the fear of excessive intimacy and they add Nacho's best friend, Ramiro and his girlfriend Cleo. Although they believed that the new couple would come to save them, in reality it confronts them with everything they have lost. When a storm leaves them adrift, once again alone and without escape in the middle of the sea, Nacho and Lucía face the question...