The Chiyozuru lineage took root in Province during the period, and the consistently trace its origin to Kuniyasu (来国安). He is said to have been born in Yamashiro Province, with one tradition holding him a grandson of Kunisue; he later moved to , where the place him around the Jōji and Sadaji eras (ca. 1362 to 1368). A parallel tradition, recorded on the signed attributed to Morihiro, names Chiyozuru Kuniyasu (千代鶴国安) as a disciple of Kuniyasu and the founder of the line. From this root descend the smiths the blades document: Morihiro (守弘), placed in the Kuniyasu line across two generations, the first set in the Ōei era (1394 to 1428) and the second in the Kakitsu (1441 to 1444) and Bun'an (1444 to 1449) eras; and Mitsuyuki of Tsuruga (越州敦賀光行), recorded as a student of Kuniyuki and known from a rare Kakei-dated . The Yamashiro inheritance runs through the whole group, even as the workmanship moves away from the Kyoto homeland into a provincial Hokuriku register.
Two stylistic strands run through the corpus, and recognizing the hand means reading where a given blade falls between them. The -derived work, seen in the attributed to Kuniyasu, shows mixed with and , the grain tending to stand () with thick and frequent ; the steel carries a whitish or, in places, slightly blackish cast that the read as a provincial inflection of Yamashiro. The on these is a mixed with , the edge breaking into , , and , with , , , and running through and a bright ; the enters or shallow , turning in with , at times vigorous enough to give a flame-like () impression. The Morihiro strand turns toward a -based with a tendency, , and , the forging moving toward near the edge; the mark this -toned, -laden manner as differing in character from the style and proper to the later line.
For , the set the diagnostic problem plainly: a Chiyozuru blade can at first glance resemble the orthodox Yamashiro work, particularly around Kunimitsu, yet careful reading of the standing grain, the whitish or blackish , and the rustic activity in the beyond what the Kyoto homeland shows directs the attribution to . The boldest pieces, wide in with and , invite comparison with Hokuriku contemporaries such as Tametsugu (越中為継), but the character of and keeps them within the Chiyozuru fold. Signed examples anchor the line: Morihiro and a Kakitsu 1 (1441) dated carrying his Tōzaemon no Jō name, and the Mitsuyuki whose Kakei date makes it documentary material of high value, dated works of the group being extremely scarce. The Morihiro of Jūyō-Bijutsuhin standing is recorded in the Kōzan , Kokon Kajibikō, and Kantō Zuiroku. Across the corpus the line holds a distinct place among and early Hokuriku smiths, carrying a Yamashiro pedigree into a workmanship the appraisers read as its own.