Mia, Gauthier, Louka and Zouzou are inseparable. Like most teenagers, they'd much rather be playing video games or making music than doing their homework. Mia, the only girl in the group, doesn't really seem to click with the other girls in her class. But as they grow up, her tight-knit friendship group will become more and more complicated as girl-boy relationships start to get interesting...

Mia's back! But her gang of friends is changing. Mia's parents sent her to a private school this year to bring her grades up, so her only chance to see her old friends Gauthier, Louka, and Zouzou is playing video games with them after school. There's a new tenant at Wilfried's place, a geek who has an interesting relationship with oven mitts. This year also brings a new challenge for Mia: a fighting-game tournament at the local video game store, with a mysterious new opponent. And there's still that haunted house around the corner...

Mia and her friends are in high school now, which means more freedom, more extracurriculars, more allowance, and even more friends! This year, Mia clandestinely attends the film club of the high school next door. She's inspired by the teacher and the club's top-notch equipment to cast her friends in some short films in between their video game sessions. Gauthier, Zouzou, and Louka are all there, of course, and so are Phoenix and the geek. There are even some new faces, which might bring some new romances for some of the friends...