Clémentine is the daughter of a famous French pilot and war hero Alex Dumat, who raised her alone with her brother Petit Boy. After she lost the use of her legs in an airplane accident, she travels the world with her family to find a cure that will allow her to walk again. Meanwhile, in her nightly dreams, she can walk and her cat Hélice (French for "propeller") can talk and fly with the help of a helicopter-like apparatus on its head. Clementine leads a battle against the demon Malmoth, with the guidance of her guardian angel Héméra, travelling in a magical blue sphere. Occasionally, in these travels through fantasy and time, she meets famous fictional characters such as Pinocchio, Aladdin and Oliver Twist. She also frequently meets historic characters, especially aviation pioneers such as Charles Lindbergh, and Kateri Tekakwitha.