A world devastated by a pandemic. Within a matter of weeks, all of the adults and children died of the disease. Only 15-18 year olds were spared, for an unknown reason. In the four ends of France (Brittany, Paris, Marseille, Lyon), four teenagers received on an online game forum a mysterious call to meet at midnight, on December 24, under the oldest clock in Paris to go back in time and defeat the virus. .

We are following this adventure with four endearing young people, whose urge to survive prevails on everything, and who, in the midst of chaos, experience everything that a young person of their age could hope for in life: solidarity, mutual aid, attachment, friendship, discovery of love and surpassing oneself.

U4 is their story.