Adaptation of a novel by Jan Brzechwa, a classic of children's literature.

10-year-old Adaś Niezgódka in a magic way gets to the Academy of Mr. Kleks. Here he takes part in unconventional lessons, meets characters from fairy tales and goes to unusual places. He also learns the secret of Mateusz's starling, turned into a bird of the prince of Bajdocie. He can regain his human form thanks to Dr. Paj-Chi-Wo's magic button.

Adaś promises Mateusz that he will find him. It will soon turn out that the shaver Filip also has his dark secret, supplying Mr. Kleks with freckles.