"Kajko and Kokosz: School of Flying" is the fourth part of a popular comic book series by Janusz Christa. It tells the story of the adventures of two Slavic warriors, Kajko and Kokosz, and their castellan Mirmił.

In this part, castellan Mirmił, Kajko and Kokosz return from hunting, but are not allowed into the castle after dark. While spending the night in the forest, they are attacked by Łamignat, who is testing his new, magical pipe. Soon, they are all attacked by bandits. After returning to the castle, Mirmił forbids closing the gate at night, which the bandits take advantage of by sneaking into the castle. Kajko and Kokosz repel the attack.

The cunning commander of the bandits, Bloody Hegemon, convinces Mirmił to learn to fly on a broom from Jaga, Łamignat's wife. The education turns out to be full of unfortunate accidents, and Jaga's house is destroyed. Mirmil goes to the Higher School of Flying on Łysa Góra, where he obtains a flying trunk and a flying ointment. During his absence, the robbers attack the castle again, but the residents, supported by Mirmil and his companions, repel the attack with magic.

After the victory, the residents of the castle throw a feast, giving Mirmil the title of "Mirmil the Brave".