Daniel (named "Microbe" for his size) meets new student Théo (named "Gasoline" for the smell he acquires at the garage he works at) at school. They're both outsiders, but get along with each other well. Eventually they decide to build a vehicle ("car" would be too kind a name, although it's an impressive beast) and head out on the road.
The two leads, Ange Dargent as Microbe and Théophile Baquet as Gasoil, are both remarkably good actors given that they're pretty close to the 14 or 15 years old they're supposed to be. They banter and bicker, and they're both bright and philosophical. It's well put together and kind of fun.