Nans and Mouts begin their new adventure on a small island off the coast of Cannes in the Mediterranean Sea with a dream as crazy as it is unexpected: to cross France and organize a hot air balloon concert flying over the legendary Mont-Saint-Michel. As always, they set off without money, clothes, or a technical team, relying solely on the generosity and solidarity of the people they meet along the way to advance their journey. To realize their dream, they must travel more than 1,000 kilometers across France, find accommodation and food, and meet a hot air balloon pilot, someone eccentric enough to raise his voice in the sky above Mont-Saint-Michel. All this without a single penny.