The Naoe school emerged from one of the most consequential relocations in Japanese sword-making history. In the district of Province, Kaneuji—counted among the celebrated "Ten Great Disciples of Masamune" (Masamune jittetsu)—established a flourishing tradition that synthesized the austere, -oriented techniques of his training with the distinctive forging methods of . Later, his disciples Kanetomo, Kanetsugu, Kaneshige, and Kanenobu moved within the province to the village of Naoe, where they continued their master's work. Because the original lineage is distinguished as "Ō-" (Great ), these Naoe-based smiths are collectively termed "Naoe ," a designation that acknowledges both their geographic relocation and their descent from Kaneuji's line. This group flourished throughout the period, producing works that adapted the bold aesthetic to the evolving martial needs of that turbulent era.
The collective style of Naoe blades presents a remarkably consistent vocabulary of technical features. The typically shows mixed with , often flowing in large patterns that tend toward ; the grain frequently "stands" (), and thick, fine is densely applied, with entering abundantly. The characteristically takes a shallow base linking widely spaced elements—rounded-headed , , pointed , and angular forms—creating a dynamic yet controlled pattern. This temper is richly animated with internal activities: and appear frequently, scatter across the surface, and the shows overlaid with . The remains bright despite thick that often includes patches of coarser crystallization, lending a vigorous, somewhat rough quality. The typically enters in , trending toward a pointed tip with deep —sometimes so emphatic as to produce a flame-like (-) appearance. In , Naoe works clearly reflect the aesthetic: wide with minimal taper from base to tip, shallow , thick (though some examples show a pared-down creating thinner overall cross-sections), and large ranging from extended chū to full ō proportions.
The enduring significance of Naoe rests in the school's successful synthesis of two great forging traditions. Where their predecessor Kaneuji bridged and methods, the Naoe smiths refined this synthesis into a recognizable house style—one that retained the bright , vigorous internal activities, and dynamic patterns inherited from Masamune's teaching, while incorporating 's characteristic vocabulary and flowing structures. The school's blades display what appraisers describe as abundant "" (martial vigor), a quality particularly suited to the large-scale warfare of the period. Because most surviving examples are greatly shortened () and unsigned, attribution relies entirely on the consistent presence of these diagnostic features in both and . The Naoe designation thus represents not a single hand but a collective interpretation—a shared technical language developed by smiths working in close proximity during a specific historical moment, preserving the legacy of their master's synthesis while adapting it to new circumstances.