A collection of humorous stories about school days in the life of primary school student Kostya Kulikov, for children aged 8–13. From Kostya you’ll learn what’s more important: good grades or interest in learning, what it means to "spill blood for a friend" and to "get into an awkward situation"—and also: how to win the heart of an outstanding student without letting the team down at competitions, how to replace a runaway actor at the main theater premiere, and much more.