The Fuyuhiro line worked at Obama in Wakasa Province, and the consistently trace its founder to . He is recorded as the son of the third-generation Hirotsugu of , said to have relocated to Obama around the Kōshō era (1455 to 1457), with one blade instead reporting that he studied under Tsunahiro of . The earliest hand is identified on a two-character attributed to the first-generation Wakasa Fuyuhiro, and the name continued thereafter, the lineage held to have run for some five generations and the signature extending into the period and the closing years of the period. Dated tangs anchor the activity firmly in the sixteenth century, with inscriptions across the Eishō, Tenbun, Genki, Eiroku, and Tenshō eras, one of them reading "Fuyuhiro, 73 years of age." Several blades carry residence inscriptions for places far from Wakasa, among them Hōki, Unshū, Izumo, , and , including a made at Matsuyama in ; whether these issued from one man or several is left by the as a matter for further study. The descent from places the line within the -, working its late, provincial idiom.
Across these blades the forging is mixed with and , repeatedly described as inclining toward , or standing grain, with and frequent . Two tempering modes recur. One follows late and Sue-Sōshū taste, a wide or mixed with , , and , carrying and , that adheres thickly and at times coarsely, with and , and in the most active examples and that build into . The other approaches , seen in a with tendency or a tighter over . A third register appears as a broad set with and . The is typically , turning or pointed with . To read the hand, the point to the standing grain and bright , the often grand construction with extended or , and the carving: with , and on one blade a with and goma-bashi whose manner is likened to Heianjō Nagayoshi rather than to . Generations and modes separate by whether the workmanship leans Sue-Sōshū or .
For , the treat the place-stating signatures and dated tangs as the principal documentary value, several blades singled out for the clarity their inscriptions bring to the line's chronology and geographic reach; one Tenshō 8 adds the invocation "" beside the and "Jūdai" cut on the . The recurring open question of the far-flung residence signatures, Hōki through , frames the standing of the name as one whose precise membership the register still weighs. Among individual works, the writers name a as a , a wholly hardened blade close to late , and a two-character first-generation piece judged the finest in and . Accompanying survive on two , one with fittings bearing the "Misu " crest, the other a black-lacquered leather mounting whose is held close in date to the blade. The present Fuyuhiro as a capable smith adept in both and and in , his Wakasa workshop carrying the - into the late and beyond.