16-year-old Lois, the namesake of Superman's girlfriend, weighs 100 kilograms and makes superhuman efforts to combat hereditary obesity. Most of all, she is upset by the inability to realize her cherished dream — to become an astronaut. Teachers try to console the best student with physical and mathematical abilities that it is possible to explore the universe without going to space. Once in the hospital after a starvation faint, Lois gets three friends - each with her own life tragedy - and goes with them to the Space Center in Toulouse to present her project at a competition for school children, and at the same time to understand that a solid body weight has undeniable advantages.