France, 2039. One night, a group of activists pursued by the state vanish without a trace. Julia Bombarth is one of them. When she awakens, she finds herself trapped in an entirely unfamiliar world: PLANET B.

Barmaid Sylvie is a single mom living with her two sons, Sofiane and Jean-Jacques. One night, Sofiane is injured while being alone in the flat which results in placing him in a foster home. Sylvie is determined to bring her son back home.

A quick-tempered 60-year-old man in a French village who decides to go to school to finally learn to read and write and a busy young teacher tasked with educating him.