Two young brothers Nicolas and Clement decide to spend their summer holidays traveling by car across the country from their hometown of Montbard, Burgundy in Northern France to Saint-Jean-de-Luz, Labourd in Southern France, where their mother lives and visit her. They also use their time on the road for sightseeing. One of them falls for a pretty young girl Prudence, whom they meet on the road. Fascinated by their plan, since she has no parents, she joins them. Slowly both brothers fall for her and she likes both of them, so in order to avoid jealousy and other issues, they simply agree to a menage a trois and to just enjoy life while they're young. But what will happen when they reach their destination and their road adventure ends?