The story revolves around two young schoolboy pioneers, Petya Vasechkin and Vasya Petrov, as they navigate their attempts at self-discovery and their shared affection for their friend, Masha Startseva.

Rusalka, a water spirit, lives with her family in the pure waters of the forest lake. When she falls in love with a Prince, she sacrifices her voice and leaves her home in the hope of finding true love in a new world – a world that does not love her back.