Science or magic? « Welcome to Paris, elected for the 68th month in a row as the least polluted city in the world. Thanks to cyanel, the air we breathe inside our houses is purified. » In a futuristic Paris, pollution is so prevalent that all greenery has disappeared. Recently, a gigantic plant appeared in the heart of the city, and the authorities are making sure no one gets close… Thomas, a young science student, is secretly studying the phenomenon, hoping for a better life. Raised by his witchcraft-loving grand-mother, he is often prone to hallucinations. One day, he crosses paths with a strange young girl with very bright eyes, who faints in the air. From then on, his fate changes…