When a self-effacing hippopotamus and an inquisitive butterfly meet by chance at the river's edge, friendship is not an option. Or is it?
While exploring the world outside of her forest realm, Sara, a princess of her clan of butterflies, reaches the river home of the hippopotami and there meets Harry. Seeing their differences as beautiful, the two become fast friends. While talking together one day, Sara disappears in a rainstorm leaving Harry to fear she has died. Instead, he discovers that she has been kidnapped and only a fearsome battle among the tree tops of the forest can free his delicate friend.