One night, in the crowded Parisian metro, Aymeric randomly bumps into Nathalie when they both enter the train. As they argue while amused commuters look on, their spark of passion grows into mutual desire, and the two decide to spend the evening together. The strangers wander the streets of Paris moving from one party to the next and delaying their goodbyes. Once the sun rises, they will become strangers again – but what if they never were?