The school is one of the most distinguished metalworking lineages of the period, rooted in Nishijin, Kyoto, and claiming descent from the legendary Munechika. The house served the Ashikaga shogunal family over successive generations, establishing deep foundations in the full range of sword-related arts -- swordmaking, blade carving (toshin-bori), the production of steel and fittings, the shortening of blades, the insertion of inlaid signature attributions (-), and the making of mountings. The school's defining figure is Myoju, active from the Bunroku era through 'ei (late into early ), who is revered as the "founder of smithing" and celebrated alongside Kaneie and Nobuie as one of the "three great masters of the period." Myoju taught both and no Kami Teruhiro, and accepted commissions from the Toyotomi and Tokugawa houses as well as many families. An earlier stratum of production, appraised as Ko-, dates from the close of the period and demonstrates that the group's technical foundations were firmly established before Myoju's maturity. The near-contemporary Mitsutada, though absent from formal genealogies, is conjectured to have been of senior standing within the circle; his works, executed on brass with an archaic dekoboko- ground, display "an even more classically archaic elegance" than Myoju's. Shigeyoshi, active from the 'ei through Genroku eras, carried the tradition forward into the mid- period.
The school's collective technical identity divides into two principal modes: iron works and soft-metal () works. In the iron mode, Myoju expressed geometric patterns -- , , -kaminari-, and rinzu- -- by means of gold , complemented by celebrated openwork including wheel and double-tomoe . The nejikaeshi-mimi (twisted turned-back rim) and gold rim inlay are techniques "at which he particularly excelled," while the iron itself is invariably "carefully selected" and displays excellent quality. In the mode -- employing , , brass, and other alloys as ground material -- the school developed a distinctive form of - (flat inlay) that retains only slight relief, deploying colored metals in novel combinations. Auspicious trees and plants -- grapes, kunenbo, oak, pine and bamboo -- are "boldly stylized into patterns, producing an exceptionally fresh and courtly (miyabi) taste." Ground textures including hammered , polished , and file-finished surfaces are deployed with meticulous care to heighten the pictorial effect. Mitsutada's work on brass with its uneven, raised-and-recessed ground and enrichment through gold and silver represents a more archaic variant of this aesthetic. Shigeyoshi synthesized the inherited - tradition with textile-derived designs of linked shippo, arabesque, and patterns -- reflecting his Nishijin milieu, the heart of Kyoto's silk-weaving district -- while deploying -, , and across grounds in both polished and stone-textured finishes.
The school's historical significance is singular: the pictorial manner of design, the - technique, and the use of non-iron metals as the ground material "all find their earliest beginning with Myoju" -- he stands as the originator of an entire aesthetic vocabulary in kinko. The consistently describes Myoju's work as possessing "the vitality that preserves the very momentum of brushwork," with a "strong connection with Koetsu and Tawaraya Sotatsu" that places him among the foremost artistic figures of the age. His compositions give "priority to open space" while expanding motifs into large-scale patterns, and the coloration of his inlay is executed "with truly meticulous care." Solid-gold , frequently melted down during periods of upheaval, are recognized as extremely rare survivals of exceptional documentary and artistic value. Together with the Goto, Hirata, and Shoami groups, the mutually influenced the broader development of Kyoto metalwork after the beginning of the period, yet in the making of the affirms that they "stand without rival." The school's enduring significance lies in its fusion of technical mastery with the bold aesthetic sensibility of the age -- works that, in the examiners' consistent assessment, "fully manifest the spirited character of culture" and convey "a deep, resonant charm."