Sveta and Stepa live in Ryazan and since childhood have sworn to love each other until death. Sveta has become a model and Stepa is leaving to do his military service. One day he receives a letter from Sveta announcing that she has broken the oath and left for Moscow with a rich producer. Stepa's pride does not allow him to give up Sveta, he swears to himself to become the world champion in Kickboxing...