Shigeyasu of Bingo is known from four signed blades designated , each inscribed with the same five-character residence signature, Bishu-ju Shigeyasu: a , a , a dated in the era, and a dated 2 (1369). The reference works on signatures, as the published sources cite them, record a Bingo smith of this name with dates of 2 (1363) and Meitoku 3 (1392), and the places each of his undated pieces within that span by form and workmanship. His signed work is scarce, and the judges say so directly: 「現存する有銘の作は極めて少ない」, extant signed works by this smith are extremely few.
His school placement shifts across the record. The two earliest papers, of 1966 and 1971, read him as a smith of the group, the specifically as Ko- work. The later papers place him in the Hokke Ichijo line of Bingo, which the published sources, following the Kokon Meizukushi, present as a genealogy distinct from the tradition, founded by Sukekuni and active from the end of the period into ; Ichijo, Kaneyasu, Shigeyasu, Shigeie and Nobukane are named among its smiths whose work survives. Both readings set him among the Bingo wakimono of the fourteenth century.
The hand itself is consistent from blade to blade. Every one of the four carries a narrow, low , the tight and adhering, with slight on the and the . The is an that flows toward the edge and tends to , with a whitish cast; on the it is a dense with a tendency to and a visible . The runs straight into a on the , the and the , and finishes on the . The published sources sum up the Hokke manner in the same terms: an mixed with flowing that raises a cast, a slightly sticky surface, a gentle, low and a , features of which they write 「大和気質の窺われるものである」, that a Yamato-derived temperament can be discerned in them. The shows how close that comes: at first glance its workmanship recalls work, though the judges assign it to the Ko- school.
Within that restraint the individual blades vary only slightly. The , a broad of thin and slightly elongated proportions with carved on both faces, mixes a faint feeling into the , with fine . The is the most robust of the four, wide and thick with a high ; its stands a little, with and , the steel slightly blackish and a standing, while the takes a shallow and mixes and along the . A -bi finished with long is carved on both sides. The , by contrast, is small in scale for a blade.
The 's judgments of these pieces are measured. Of the it writes 「地刃の出来は三原派の特色をよく示しており、なかなかよく出来た太刀である」, that both and clearly display the features of the school and that it is a notably well-made . Of the dated it writes 「地刃に備後物の特色をよくあらわした資料的価値の高い作である」, a piece of high documentary value that plainly expresses the features of Bingo work. Of the it notes that the blade 「渋い味わいを呈している」, conveying a subdued, austere flavor, and that 「応安二年紀は資料的に貴重で」, its 2 date being of particular documentary value; it also records other dated works by him of 4 and 1.
Shigeyasu therefore stands on the designated record as a small and coherent body of work: four signed blades, none at the level or above, with no recorded provenance of named owners. All four sit in the tier that can, in principle, pass between private collections, but with so few signed works known one appears only rarely, and a dated example is sought as much for the gap it fills in the reference works as for its quiet Bingo .