Yukihiro was a smith of the school, which emerged in the early period under the leadership of (), commonly known as O- or . The school "cast off the previously classical manner of Kyushu workmanship" and "established a refined style in which both and are bright and clear." Within this lineage, smiths such as Yasuyoshi ('s son), Yoshisada, Kunihiro, Hiroyuki, Hiroyasu, and Sadayoshi inherited the master's approach and were highly active. Among them, Yukihiro occupies a singular position: the consistently identifies him as the smith "whose extant dated works are the earliest" and "whose workmanship approaches most closely that of ()." A National Treasure dated Kanno 1 (1350) constitutes the principal documentary evidence for establishing his period of activity, and its workmanship is recognized as "virtually indistinguishable from himself." The existence of a signed reading "Chikushu-ju ," whose chisel handling closely resembles Yukihiro's customary manner, has led the to observe that "among works bearing 's name there may be pieces made as (substitute workmanship) or bearing (substitute signatures) by Yukihiro."
Yukihiro's characteristic forging is mixed with , densely packed, with fine adhering thickly and entering frequently. is a recurring presence. His is typically mixed with and , though works in with a shallow -gokoro (wet-looking quality) also appear. The is deep, adheres thickly, and fine and run throughout. The is consistently described as "bright and clear" -- the defining hallmark of the school carried to its highest expression. The characteristically becomes pointed, often with (thrusting upward), and turns back deeply, a feature the singles out as "a major highlight of appreciation." In longer works such as , the style shifts toward mixed with and angular or -ba elements, while retaining the luminous clarity. The robust of his -- with broad blade, thick , and ample -- is noted as meriting "particular commendation."
The 's evaluative language places Yukihiro at the apex of the school's second generation. He is repeatedly described as possessing "the most outstanding technical ability" within the group, producing work that displays "a manner that connects in a single stream to Great ." His finest pieces are characterized as showing and that are "vividly clear, richly active, and thickly covered with ," presenting workmanship "close to ." The phrase -- sound and well-preserved -- recurs across multiple designations, underscoring the physical integrity of his surviving work. Both signed and attributed pieces are recognized as "extremely rare" and "extremely precious," and his role as a possible proxy craftsman for himself elevates his historical significance beyond that of a mere student. In the judgment of the , Yukihiro stands as the essential bridge between the founder and the broader tradition.