Established in 1891, the Koiwai Farm is the largest private farm in Japan, boasting a vast area that spans approximately 3,000 hectares. What had formerly been a wasteland was transformed into a farm by improving the soil over several decades in efforts for afforestation. The farm’s main industry is the raising of livestock centering on dairy cattle in addition to forestry. In the latter, a “normal forest” has been implemented since 1964, a system proposed in Germany in the 19th century that enables an annual fixed wood supply by making the area of each age stand the same. Such practices, even rare in Germany, are implemented here for none other reason than in an aim towards maintaining a sustainable farm.