Koiwai Ranch (Koiwai Farm) is the largest stock farm and private ranch in Japan. Open to the public, visitors can milk a cow, participate in archery, watch sheepdog shows, ride horse-drawn carriages and buy various souvenirs and dairy products. Extending out from the foot of Mt. Iwate, the ranch also possesses various motels for visitors and museums.
The appearance of the Koiwa Ranch was based on real-life images of the location.
- In the Tokyopop translation of the manga, Koiwai Ranch is misspelled as "Koiwa Ranch".