ItsuoDoi

The story

Itsuo Doi (土井逸夫) is a Sakai forging blacksmith, a 鍛冶師, on the craftsman roster of Aoki Hamono, the maker behind the Sakai Takayuki brand. Sakai splits the craft in two: forging and sharpening are separate professions, done by different specialists. Doi is a forger. He hammer-welds and shapes blades that other masters then grind and finish. Aoki's roster lists his specialty in one word: 打物, forged work.

Ask what he's actually famous for and the answer is Aogami #2, and how gently he treats it. Hotter steel moves faster under the hammer, but it burns carbon out of the edge. Doi forges cool. He reads the steel by flame colour instead of a thermometer, at roughly 850°C, so the carbon stays where the edge needs it. Suisin builds its Hayate line on this inherited Doi process and describes it as low-temperature joining with controlled hammer forging on Yasuki Blue #2. His prestige work is single-bevel, yanagiba and their kin, though he forges double-bevels too. The Homura Guren kurouchi series (petty, nakiri, gyuto in Blue #2) is his hammer work, and the "red lotus" name comes from the colour of pine-charcoal flames in the Doi forge.

His signature series is 飛燕, Hien, "flying swallow", part of Sakai Takayuki's 四神 Four Gods series. The maker's own page calls it a katana-evoking Blue #2 blade and credits it to "the Sakai smith Itsuo Doi, who inherited the secret techniques across three generations". It's a kengata yanagiba with a gently curved spine, wider and heavier than a standard yanagiba, forged by Doi and traditionally sharpened by master sharpener Mitsuo Yamatsuka. Its sibling Genbu, a mirror-finished sakimaru takohiki in retailer listings, comes from the same forge. For years he also worked on the brand's Tokujō (特上) line. Current listings put Tokujō production with the Togashi workshop, so we treat that chapter as history, not present tense.

He is the son of the late Keijiro Doi (土井敬次郎), one of Sakai's most celebrated blacksmiths, the man behind Sakai Takayuki's Blue #2 yanagiba for many years, certified a Traditional Craftsman in the 1980s per workshop records. He died in November 2017, aged 90. Aoki Hamono's craftsman page records the succession plainly: Itsuo "studied under his father, praised as a master craftsman, and acquired the secret techniques" of the Doi forge. He entered it at 24. That's a forging career now past fifty years.

Owners on the forums talk about him the way we'd want them to: honestly. "Doi's Blue #2 is excellent." "Underrated as hell." A preference for his single bevels over the doubles. And, fairly, some notes that grinds run stout and fit-and-finish varies. We'd rather show you that conversation than sand it down.

A note on records, and it turned out to be a good story. Several retail sites describe Doi as a certified 伝統工芸士 (Traditional Craftsman). No current registry lists him, and Aoki's own roster leaves the mark off his name while six of his colleagues carry it. That looked like a retailer error until we asked Sakai Takayuki directly. The answer: Doi held the title, genuinely, and at some stage gave it up. The reason is his own, and we won't guess. His father Keijiro held the designation. Itsuo forges without it, by choice.

We have been visiting Doi's forge for over a decade. The first time was July 2014, in the kind of summer heat that has you sweating from five meters away while Doi works fully covered against the forge; we came back that November, again in April 2022 right after Covid, and again in December 2023, when the photos of him at the charcoal forge were taken. The span is the point: the same man, at the same forge, doing the same work across nearly ten years. We put the photographs and the story of those visits into "Three visits to Itsuo Doi" on our blog.