Imagination and the World of Fantasy are in danger. Mar, an eight-year-old little girl, who's an expert in stories and legends thanks to the books read to her every night by her grandfather, decides she has to try and save them. With the help of her friends, the Lunnis, they will embark on a magical adventure to stop them disappearing.
A new school year begins at the High School Argentina (HSA), and the students return from the summer vacations. Fer, the captain of the school rugby team, the Jaguars, discovers that Agus, his neighbour and classmate, has changed a lot over the summer. Delfi, however, continues being vain and wastes her time dominating her poor brother, Walter, and her associates Alicia, Clara and Valeria, or, as she prefers to call them, "The Invisibles".