Mina and Océan, two teenagers who don't know each other, meet on the same roof on the same night and share the same intention of jumping to their deaths. It's a coincidence that short-circuits both of them. No matter how hard they try to ignore each other, and even push each other away, in order to carry out their fateful plan, they are bound together, irretrievably.
Alain, a former mountain guide, decides to change his life and become a teacher. He finds himself faced with colorful ninth graders who are not interested in anything. Seeking to motivate them and bring them together, Alain decides to organize an outing... in the bowels of a glacier. The students discover a breathtakingly beautiful world of ice. The idea that this glacier could disappear is unbearable for them. Trained by Alain, the students throw themselves body and soul into a crazy project: to prevent the glacier from melting and nothing can stop them!