The fairy tale tells the story of a very wise Japanese judge, Ooka, who, when judging disputes between merchants, slaves, and even mayors, always listens to both sides first and then makes a fair decision. With his tricks and correctly asked questions, no perjurer or swindler escapes his notice.

In a mill, far from people, lives a miller with her daughter Vojtěška. There is no man's hand here, but behind the dam of the pond lives a waterman, who does not leave the miller without help in difficult times. When the mill is most busy, unexpected help appears - a young traveler. Yesterday Vojtěška claimed that such a person had not yet been born, so that she could only look at him with her eye...