野原の争いのルール
Episode 5, The Size of the Field
In this country, there is a rule so that there is no conflict in the battle for the field.
畑の広さの決定
It was that it matches the previous year's harvest and the next year's the size of the field would be decided.
山中地区の特徴と昔話
Moreover, the size of the field must be square so that it is easy to check.