The third generation of Koju, Matahachirou Yasuda Masakiyo served Hideyoshi Toyotomi. And the fourth, Mtasaburo Masanaga served the Shogun Ieyasu Tokugawa.

Ieyasu was an enthusiastic Koh admirer and a collector of precious Kohboku. His collection was quite extensive. Property left after Ieyasu's death was distributed to three Tokugwa branch families; Owari, Kii and Mito . Massive amount of Kohboku as well as Koh utensils were found there. The weight of Kohboku distributed to Owari family alone amounts to 386 kg. How much will that be in a modern criteria? Kyara, the product of miraculous natural consequences is also known as the fragrance jewelry. The value of high quality Kyara is more than a dozen times of that of pure gold. Based on today's value that Kyara per gram costs 18,000 yen in today's currency, the total value of Kyara that Ieyasu owned amounts to 90 billion yen, on the assumption that he had collected 500 kg,

After the Tokugawa Shogunate started, the nation went into the period of national seclusion. Domestic culture prospered. Among less significant periods of Edo era, the periods of Genroku, as well as Bunka-Bunsei are times when the nation's culture reached high-maturity

Koh which had been cherished by court people in Heian period was later appreciated by and permeated among Samurai. Further down in Edo period, it spread into commoners.

Koh-do initially born to be performed by court people in Muromachi period became artistic entertainment popular among wealthy merchants in Edo period.

It was in Edo period, when Juemon Takai Koju, a distinguished Koh expert came into being. He was so remarkable in his profession that “Juemon Takai” became a synonym of Koju.

Since the first of Edo period to the seventeenth of Showa period, Juemon Takai has been a professional name of Koju. According to some record, the Koju as a purveyor to the Emperor Kokaku dedicated “Meiko Motochitose” to the Emperor, “Wakakusa” to Yabuuchi school of tea ceremony, “Kokonoe” to another school of tea ceremony, Omotesenke.

Tadachika Kuwata mentions Juemon Takai in “Dictionary of tea ceremony” (1956) “Juemon put ‘noren,' a shop curtain to show a sign of ‘Koh utensil professional. The calligraphy on white cloth was a work done by Shizuma Sasaki.” Fifty years after the time of seventeenth Juemon, the profession of Koju is handed down as a task of Nippon Kodo Inc. It is one of original Koh culture to be sent to the world. The traditional culture of Koh is living nest to you.