In one of the poorest areas of Paris, a school counselor devotes herself to working with disadvantaged students, while facing challenges of her own.

Lucas lives in a farm in southwest France. For his 17th birthday, his uncle Nico offers him a special surprise : a trip to Lady Dallas.

Oscar, Simon, and Aïssa, three childhood friends, go to Paris to celebrate some good news. But on the night bus taking them home—the N121—an exchange between passengers spirals out of control, and the situation quickly goes off the rails.