The Tetsugendo (鉄元堂) lineage emerged in Kyoto during the mid- period, founded by Okamoto Genbei Toshiyuki, who trained under Tetsuya Denbei Kuniharu (鉄屋伝兵衛国治). Known by his working name Naoshige (尚茂), the founder later adopted the art name Shoraku (正楽) after taking Buddhist tonsure, and died in An'ei 9 (1780). The lineage passed to a second generation, Naofusa (尚房), whose works also survive. Together with Ichinomiya Nagatsune and Otsuki Mitsuoki, the first-generation Shoraku was celebrated as one of the "Three Outstanding Metalworkers of Kyoto" (Kyoto kinko no sanketsu). The broader circle of Kyoto kinko working in related idioms includes Hosono Sozaemon Masamori, a metalworker resident at Nijo whose dated works span from Genroku 3 (1690) to Kyoho 3 (1718), and Yamazaki Ichiga (also called Nizaemon), whose first generation studied under Goto Shujo and whose line continued through several generations.
The hallmark of the Tetsugendo school is its commanding mastery of iron. Shoraku worked chiefly in iron and earned a reputation as an artist who "handled iron with exceptional freedom" and "tolerated no rival" in that material. His characteristic method builds compositions upon a polished iron ground (tetsu ) or a finely struck surface, developing figures through that transitions seamlessly into fully developed (high relief), imparting depth and a heightened sense of volume. At key points across the iron plate, inlays of gold, silver, , , , and brass are applied with meticulous -- a combination "often regarded as a difficult undertaking" on iron, and one that the repeatedly describes as achievable only by Tetsugendo. Subjects are overwhelmingly figural and grounded in direct observation: scenes of figures caught in a sudden evening shower (yudachi) rank among his greatest specialties and "many examples of this subject are known"; exotic depictions of Tatar (Dattan) figures with Western dogs recur across and other fittings; and literary themes such as Kisho (Returning Woodcutter), Genjouraku (a gagaku court dance), Fujin and the Great Buddha, and Nanbanjin (Southern Barbarians) are rendered with rich naturalistic observation and a muscular vigor the call his "true mettle" (shinkotcho). Hosono Masamori, working on and grounds rather than iron, developed a parallel pictorial world through exhaustive and combined with - of various colored metals, producing panoramic townscape and agrarian scenes of extraordinary descriptive density. Yamazaki Ichiga, drawing on his Goto-school training, employed and on in a manner "in no way inferior to the productions of the Goto house," enriched by lavish gold that yields a "sumptuous and brilliant style."
The Tetsugendo lineage occupies a distinctive place in the tosogu canon as the foremost Kyoto school specializing in iron. The first-generation Shoraku's consistently demonstrate what the describes as "a level of finish achievable only by Tetsugendo," from the subdued, moist richness of his iron plates through to the polychrome inlay work executed down to the smallest details. His yudachi compositions -- capturing the clamor and confusion of an evening squall across matched sets of , , and other fittings -- are "very much his own domain," while his Tatar-figure , including a dated example from Tenmei 2 (1782), are valued both artistically and as documentary evidence for research into the first- and second-generation question. The depicting -hiki on an imo-- ground of gold and reveal Shoraku's capacity to work outside iron with deliberate archaism, evoking the manner of Goto Yujo. The second generation, Naofusa, maintained the lineage's standards, as seen in collaborative sets where the is by the first master and the by the second, exemplifying the school's "established reputation for excellence in ironwork and superiority in inlay technique." Hosono Masamori's panoramic scenes of Kyoto street life and agrarian labor, rendered with a minuteness in which "even the conversations among the people might be heard emerging from the scene," and Yamazaki Ichiga's refined Goto-inflected work on , further attest to the depth and range of this Kyoto kinko circle.