Russian folk tale about a father whose three sons go out to finds themselves brides. Two of the boys come home with perfectly normal girls, but the youngest brother, Ivanushka, brings home a frog from the marshes. His father finds this most curious, but what he does not know was that the frog was actually a beautiful girl named Vasilisa who was cursed by a magical serpent whom she refused to marry. Now Ivanushka must overcome tremendous obstacles to restore Vasilisa to her true form and free her from the serpent's spell.

The film takes place during the German occupation of Ukraine in 1919, the main characters are folk characters - the brave soldier Semon Kotko and the beautiful girl Sofya.