Brian (Anton Yelchin) is a little-known writer who struggles with rejection letters every day. By chance, Brian met a woman named Ariel (Bérénice Marlohe). This gentle and mature woman almost satisfied Brian's fantasy of the opposite sex. There was only one regret, Ariel was married. However, Ariel told Brian that he and his husband had an agreement, that is, between 5 and 7 o'clock every day, both of them were free and unbound by marriage, and could do whatever they wanted, even find another relationship. Under Ariel's persuasion, Brian accepted and joined their relationship.