The imonikai, a traditional Yamagata fall event Enjoy rustic foods at an imonikai.One of the great traditions of fall is this great outdoor stewing party. It seems that everywhere in Japan has a different way of doing this tradition. Even in Yamagata, where the tradition developed, there are variations, and the local customs of Okitama are a special treat. A merry gathering of friends around the fire is a great way to celebrate fall.