New Year's Eve. A group of friends, all around 18 years old, get together for a party. Ties of love and friendship are formed and broken off. At the frontier between carelessness and seriousness, their true natures come to light.
Arthur and Anna are a young couple spending a few peaceful weeks on vacation. After a chance meeting at the beach, they are invited by Damien and Agnès, a young couple too. However, the evening will take a very special turn.