Gagarin Towers is a massive red-brick housing project located on the outskirts of Paris. Yuri, who is 16 years old, has spent his entire life in this complex. His ambition is to one day travel the galaxy in space. Yuri becomes a member of the resistance after learning about the intentions to demolish Gagarin Towers. In company with his close companions Diana and Houssam, he sets off on an adventure to rescue their house, which he refers to as his "starship."