Goodbye, Boys! is the coming-of-age tale of three teenagers graduating from a Communist school during World War II. It's summer, and their main goals are swimming in the Black Sea and wooing the girl all three of them love. However, they are asked to become officers in the military, and slowly their worlds begin changing forever. Their parents oppose them, they begin fearing losing each other and their families, and the military tricks and maneuvers them into joining the army instead of the navy.

A female commissar is sent to the naval detachment, led by the anarchist Vozhak, on behalf of the Party Central Committee. She is tasked with subordinating the sailors to the cause of the revolution.

The film is about the hot war summer of 1944. A group of several gun crews defends a tiny bridgehead on the right bank of the Dniester. The fates of the main characters: the front-line soldier-battalion commander Babin, the young lieutenant Motovilov, the nurse Rita Tamashova and the rank-and-file gunners, soldiers, among whom are brave people, faint-hearted and scoundrels, unnoticed heroes, are shown in a setting of several hours of peaceful life before another violent attack of the enemy, after which not everyone will survive...

Four former soldiers reunite 25 years after the war. Last time they saw each other on the Byelorusian railway station in the summer of 1945. Now they've come together to mourn the death of a friend.