Kokai Koi farm operated by Kokai Ryoji and is located in Tokamachi City, Niigata. While this farm is not as well known as other farms, it has established a reputation for high-quality, niche varieties such as Goshiki, Ginrin Goshiki, Doitsu, Ochiba, Doitsu Kohaku, Kujaku, Beni Kumonryu, Ginga and others that are highly sought after by international dealers.
