Yuasa had been developed as the castle town of Yuasa clan since Heian Period. In the middle ages of Japan, Kumano pilgrimages became so popular and this town became one of the trails to Kumano Shrines. During the Kamakura Period, one of the Buddhist priests went to China and learned how to make Miso. During the process of making Miso, he found out the Soy Sauce from the leftover of Miso producing.