Axelle, Hugo, Kareem and Victor have a cancer. They stand up to the ordeals of the treatments with the help of their loving parents and of the medical team that is as warm-hearted as it is professional. Their struggle takes us into the world of advanced medicine, rough and sophisticated at the same time, which perform miracles but cannot accomplish everything. During a period of over 18 months, 'I’ll get better tomorrow' follows the course of the treatment, from the diagnosis to how the treatments affect the various aspects of human experience: the functioning of the body, death, revolt, gentleness and the exuberant spontaneity of childhood.