The film tells the story of several volunteers, soldiers of the International Legion of the General Staff of the Unified Armed Forces, a unit called Ronin Team. During their service, the soldiers become true friends: they work, study and rest together. However, a time of trials for the courage and skills of the legionnaires comes. The hot summer months are not easy for them. And not all recruits can withstand the high pace of training and service. Meanwhile, troubling news of the Russian offensive comes from the front.