Yann is a successful insurance broker who is miserably bored with his life. At his own birthday party, he ignores his guests and instead spends the evening looking at a box of old photos from high school. Yann decides to call his best childhood friend, Thomas, and he finds that he hasn't changed a bit - he is still a wild and crazy guy. Together, they decide to recreate the epic high school bash that neither can seem to forget. As they set out to enlist their old former classmates, they realize just how much things have changed.