Viktor and Olga have long been living in a hateful marriage. They've finally paid off their mortgage and seem to enjoy life in their own apartment, but the neighbors on the side turn out to be too passionate for a new building with thin walls. One day, those same neighbors come to the couple with an offer to have sex together. Viktor and Olga refuse, then agree, refuse again - and the incident seems to be over, but a third couple has already arrived, constant "close friends" of the neighbors on the side.

The war burst into the peaceful life of three friends suddenly, forever changing their destinies. Each of them went to the front, leaving the most valuable things at home in order to fight for this most valuable thing. Surprisingly, they are helped to survive in this fiery hell of battles with fascism, music. Taking musical instruments with them, friends play to maintain the morale of fellow soldiers, as well as to compose the leitmotif of Victory so desired by all.