Below Sendai Castle, at Kokubu Wakabayashi in Miyagi District of Ōshū (later Rikuzen, present-day Sendai), the first Kunikane established a forge that served the Date house across the early period. The record him as a member of the Hongō family, first called Genzō and later Yoshinosuke, born in Bunroku 1 (1592), who claimed descent from a later branch of Yamato Hōshō Gorō. As a retained smith (kakae-kaji) of Date Masamune he was sent by his lord's command to Kyoto in Keichō 19 (1614), where he studied under no Kami Masatoshi; he received the court title Yamashiro Daijō in 'ei 3 (1626), took the tonsure upon Masamune's death in 'ei 13 (1636) under such Buddhist names as Ninzawa Yōe and Yōkei, retired in Shōhō 2 (1645) at fifty-four, and died in 4 (1664) at seventy-three. The house continued through his legitimate son, the second-generation Kunikane (Hongō Kichiemon), born Keichō 17 (1612), who succeeded to the headship in 1645 and received the title Yamashiro no Kami in 7 (1667). Other Sendai hands appear in the register as well: a Rinsuke (倫助) of the lineage as Anrin signing "Ōshū Kokubu Sendai-jū," and later signatures reading Yōe Kunikane and the Shōwa-era Yōke Kunitsutsumi, carrying the line forward.
What binds these blades into one hand is the deliberate transplant of the Hōshō manner onto Sendai steel. The describe the first generation as turning, in an age when the tradition was widely practiced, toward the working range of the Yamato Hōshō line: a high , a forged , and a -based temper. Recognition begins in the , a running well throughout, often tending toward standing grain (), with fine entering and adhering thickly over clear steel; a frequently rises from below the , called a habitual trait of both first and second generations. The temper is a chū- or carrying a shallow , into which uchi-noke, , , and a -like effect mingle along the , with deep , well-adhering , and and running through; the runs straight and tends toward with vigorous . Generations divide on detail rather than idiom: the first generation's strongest pieces show the at its most ordered with a bright , while the second generation, equally schooled in the family specialty, sometimes works toward and finishes with a quiet warmth; certain late first-generation works, such as the dated 'ei 19 , depart unusually into a primarily ground with whitish .
For the register fixes the points plainly: ordered with and , the -and- edge with carried into a , and the rising habit. The signature itself is a marker, the noting that from 'ei 9 (1632) the grass-radical of the character 藤 begins to be chiseled as separated strokes resembling a "#," and that the rarer "Yōe" form and examples bearing Kunitsugu's carry documentary weight. Named works anchor the line: a signed Yamashiro Daijō Fujiwara Kunikane transmitted in the Uwajima Date family, with an iron signed Myōchin Sōhei; first- and second-generation held in the Imperial Collection; a bearing the kuyō crest of the Date house said to have been bestowed by Masamune; and a carrying a Yamano Ka'emon cutting-test inscription dated 4. The place the first generation's best blades at a level close to, and at points surpassing, the old Hōshō master, and present the Sendai Kunikane house as the enduring carrier of the Yamato Hōshō manner under Date patronage through the period.