[1][2][3] The film tells about a schoolboy who no one takes seriously until a new student appears in the classroom.
One day, a new student, Zhenya Karetnikova, joins the class — a calm, smart, and serious girl.
Lyosha becomes friends with her, and through their interactions, he gradually realizes that his troubles stem from his own laziness and unwillingness to improve himself.
Lyosha begins to work on himself, becoming stronger, braver, more diligent, and resourceful.
During a relay race, his class team competes, and Lyosha has to step in for a teammate who is unexpectedly unable to participate.