Representing the 600-year history of Sakai blade making. Keijiro Doi was a legend for forging low-temperature Blue Carbon Steel — a process that required fewer hammer blows than standard forging and produced blades of exceptional purity. The workshop utilizes a strict division-of-labor system, passing blades between master forgers (kajishi) and master sharpeners (togishi). Today's line spans affordable production knives to ultra-premium ZDP-189 blades.