A country called Childhood. Who wouldn’t want to plunge into this wonderful and cloudless world again? But suddenly, a magical dream turns into a harsh and unpredictable reality. Unexpectedly for himself and in a completely inexplicable way, the 49-year-old hero, reserve lieutenant colonel, history teacher, again becomes a seven-year-old first-grader, falls into his own childhood. What will the explosive mixture of childish spontaneity and adult consciousness lead to? How to respond to juvenile hooligans and not very competent teachers at school? How to force yourself to draw sticks in copybooks, having two higher educations and a whole life behind you? It was not possible to adapt.