From the close of the period into the , the Hosho school worked in Takaichi District of Yamato Province, the old province whose forging traditions grew up around the great temples of Nara and answered to their need for arms. The line belongs to , one of its five schools alongside , Senjuin, Shikkake and , and like them it carried the conservative temper of a smithing world bound to monastic patronage. Its smiths share the character as the common element of their names, among them Sadatsugu, Sadamune, Sadayoshi, Sadakiyo, Sadaoki and Sadamitsu, and the published sources rank Sadamune and Sadayoshi as the two most knowable hands, recording that both styled themselves Hosho Goro. Sadayoshi is the smith who most often inscribes his residence and a working date, anchoring the school to the very end of with eras such as Bunpo, Genko and Karyaku; Sadakiyo and Sadaoki follow as the textbook hands through whom the group manner is read in full, while Sadamitsu carries the idiom forward into the generations.
The forging is where every Hosho smith is known. Across the school the becomes an all-over , the straight grain running cleanly from to point and out onto the , frequently with a flowing tendency, the steel dense and refined with thickly adhered and entering along the grain; a stands faintly over the on the more tightly forged . Over this grain the smiths temper a quiet , often a carrying a shallow with small and , the temper not standing apart from the steel but intertwining with it and fraying repeatedly into , gathering , and along the , with and running through and the clear. The published commentary names the school habit exactly, that from around the upward the tempered width broadens while the turns one step stronger. The runs into the , which finishes with vigorous , at times a flame-like form, at times a small turnback, and the straight grain tends to open into ware. Within this shared vocabulary the hands diverge by degree: Sadayoshi forges the coarser grain with the strongest , while the slightly later Sadakiyo and Sadaoki read calmer and cleaner, quieter in both and .
To a Hosho blade is to read that pure, total , for the distinction from the rest of is drawn there: , Senjuin, Shikkake and forge a -leaning , while Hosho commits to the complete straight grain, the most conspicuously individual manner of the five Yamato schools. The tang carries the second tell, filed in , the cross-hatched cypress-fence pattern, and cut off bluntly at the tip, with a darkish iron color the sources count among Yamato work as a point to be appreciated. Workmanship is uniform enough that the smiths are told apart chiefly by their signatures, so that signed and dated Sadayoshi pieces are the most fixed, while the unsigned given later gold-inlaid or attribution are read as Hosho from manner and era. Of the best hands Sadayoshi stands highest, graded Sai-jo in Fujishiro's ranking, with Sadakiyo and Sadaoki close behind on a thin spine of designated work; predominate throughout the school, the form of slender width and thick showing the old inward , with rarer , and blades among the survivors. Provenance for the group runs through the houses, the Hosokawa and Date families among them, while the shortened preserve in their inlay the names of and appraisers, a school that made its grain its signature.