Since they were little, Felix and Sylvain have dreamed about going beyond the stars and becoming astronauts together - but in the future, only Sylvain ends up succeeding. When he goes off on a 6-month research expedition to the International Space Station, Felix is left behind on Earth to figure out how to cope with this new Sylvain-shaped emptiness in his life - and 6 months is proving to be very difficult for the both of them.