Follow the summer of Billie's 16th birthday, a lifeguard at the water park, with her two best friends, Rosine and Juliette, as well as her perfect big sister, Annette. Billie's summer is quickly turned upside down when she falls in love with a charming cycling champion.

Emma is an ambitious computer science student at the Academy of Advanced Technologies. When she develops Kairos, an artificial intelligence for her final project, she is unknowingly shaping the course of her own life, as it can generate statistical predictions to guide her in shaping her future… But at what cost?