During the era of the third Tokugawa shogun, Iemitsu, to strengthen the shogunate, many daimyo clans that did not align with the central power were dismantled. Among them, the ronin from the Higo Kato domain harbored a grudge against Yanagisawa Tajima-no-kami, who was at the forefront of these suppressions. Tajima-no-kami had two sons, Jubei and Matashiro. While Jubei was prudent and thoughtful, Matashiro was of a free-spirited nature. However, both were devoted to their father and were exceptionally skilled in the way of the sword.