Tanya, a young educator, accompanies twelve teenagers to a theatre festival in Sochi under the supervision of Maria Genrikhovna, an experienced head teacher. Initially, there's little sympathy between the two teachers. However, they discover a deeper bond in much more fundamental things: aversion to marching in formation and other forms of officialism. Their ability to find joy even in challenging situations unites them.

Spring 1942. Moscow schoolgirl Katya is corresponding with a cadet of the naval school Kostya, who is unknown to her. When sent to the front, his echelon must pass through Moscow, and they have a chance to meet ... Our days. Muscovite Katya, a talented violinist and a wild child, without realizing it, begins to follow in the footsteps of the history of Katya and Kostya, her peers from the war years. Will she be able to finish an amazing teenage love story that began years ago?