no Kami Kuniyasu, commonly known as Genzaemon, was the third son of the first-generation Kawachi no Kami Kunisuke and the younger brother of Naka-Kawachi (the second-generation Kunisuke). Working in Osaka during the era, he belonged to the foremost lineage of Osaka swordsmiths. His manner of workmanship, like that of Naka-Kawachi, excelled in , and in technical skill he ranked second only to his elder brother. The designation records repeatedly note that among his works there are pieces that approach the level of Naka-Kawachi, though comparatively few attain that standard across both and .
Kuniyasu's blades clearly display the : an evident taper between base and tip, shallow curvature, somewhat thick , and a compact . The forging is characteristically a finely compacted with plentiful fine and delicate , forming the beautiful, clear steel that is thoroughly characteristic of Osaka . The consistently begins with a at the base, above which the temper develops into mixed with ; in his finest works, (fist-shaped clove patterns) are intermingled, at times with the crests aligning to form "layered-flower" . Thick enter well, adheres with areas of strongly forming , and and appear throughout; the is bright and clear. The is typically with a turnback.
What distinguishes Kuniyasu's best work is a quality the examiners describe as approaching Naka-Kawachi: the is well preserved, the blades are sturdy with a powerful "in-hand" feel beyond what their dimensions suggest, and the gorgeous reveals his high technical level. Particularly praised is his ability to temper with a suitably "broken" nuance, introducing rises and falls and variations of scale so that the overall impression gains a natural texture rather than becoming uniform and rigid. His range from standard proportions to dignified large-scale works extending beyond two six , and in each the is imposing. When the quality of both and is at its height, the designation records affirm that his work may be chosen without distinction from that of Naka-Kawachi himself.