Sixteen-year-old Yuri lives in a high-rise housing complex on the outskirts of Paris. He dreams of becoming an astronaut and has a talent for engineering. When authorities decide to demolish the aging building, he refuses to leave his home. Together with his friends Diana and Houssam, he sets out to save the complex by turning it into his own space station. Yuri creates a closed ecosystem and life-support system inside, trying to preserve the last memory of his community and dreams.