Rome, 1989. On his last day of high school, Luca gets in trouble when he takes it all out on hated literature teacher Martinelli, only to discover he's going to be heading the examination board for his finals. During a summer of fruitless study, he falls in love with a girl he met once at a party, unaware that she's Martinelli's daughter. The latter, strangely enough, has just offered Luca to prepare with him...
Alex Belli is a 37 year old advertising executive whose fiancée Elena has just left him, and who is having difficulty at work trying to think of a good advertising campaign for a new Japanese product. Niki is a bubbly 17 year old student. She has three best friends with whom she shares all her problems, and an annoying ex-boyfriend Fabio who is set on getting her back, but Niki's not interested. One day on his way to work, Alex collides with Niki on a city street. They soon begin a romance, despite their 20-year age gap.
Several characters coincide during the Christmas holidays in the winter season of Saint Moritz.
