Young Leningraders, yesterday’s schoolchildren, are entering adulthood. Sonya is in love with Styopa, but he loves Tanya, and Tanya prefers Fedya. The rejected Styopa leaves for a distant Siberian city and starts working at the factory, studying at the evening institute. Sonya leaves after him and gets a job at the same factory. Tanya and Fedya, having married, go to college, and the young husband has to earn some money as a driver to support his family. The selfish nature of Tanya refuses to put up with the modest position in which the newlyweds are forced to be, and she starts an affair with an elderly composer...