Twin sisters Asya and Slavka dream of enrolling in a nautical school. After the first refusal, the girls go to Transbaikalia, get a job at the fur farm, make real friends, fall in love, experience all kinds of adventures and still dream of the sea.
The girl Mariuka goes in search of her brother Grigorash - he was carried away by the evil sorceress Kloantsa. On the way, the girl helps the Walnut Bush and the Giant. The bush gives her a magic tree twig...