Grzegorz and Magda have been married for twelve years and they feel happy, although the routine is already taking its toll on them. Adam and Natasza have just got engaged and they naively believe that all the best moments are still ahead of them. Adam's closest friend, Jacek, is an eternal bachelor who appreciates the charms of single life above all. Despite different experiences, everyone agrees that a romantic relationship often resembles a roller coaster ride.