There is a knife in the Japanese culinary tradition that experts describe, when pressed about its origins, with a word that is unusual in a culture where most things have precise historical explanations: mystery.

The Yanagiba (Kiritsuke) — a yanagiba with the straight-tipped, angled profile of the kiritsuke rather than the curved point of the standard sashimi knife — is one of the most visually striking objects in the Japanese knife world. It is also one of the most technically demanding to use and to maintain. And the question of why it was made this way — who made the first one, for what purpose, with what intention — is one that specialists in the field genuinely cannot answer with confidence.

This is a more interesting situation than it might first appear. In a tradition as documented and as deliberate as Japanese knife-making, the existence of a form whose origins cannot be traced is itself a piece of evidence about what the form is for.

To understand what the Yanagiba (Kiritsuke) changes, you first need to understand what the standard yanagiba's curve is doing.

As explored in the Yanagiba article in this collection, the yanagiba's pronounced curve is not aesthetic. It is a geometric solution to a physical problem: the human arm moves in an arc, and a curved blade allows the force applied through that arc to remain consistently perpendicular to the ingredient throughout the pulling stroke. The curve and the arm work together. The pulling cut that results — the long, uninterrupted stroke through a fillet of fish — is made more efficient and more precise by the geometry of the blade.

The Yanagiba (Kiritsuke) replaces this curve with a straighter profile and a flat, angled tip. The visual effect is dramatic — the angled tip gives the knife a silhouette that many people find more visually compelling than the standard yanagiba's gentle sweep. The functional effect is more complex.

The kiritsuke tip does offer a genuine functional advantage — in a specific context.

When breaking down large blocks of tuna or other substantial fish into saku — the rectangular portions that will eventually be sliced into individual pieces — the yanagiba's curve can become an obstacle. The stroke required to cut a large block cleanly, from one end to the other in a single pull, is a long, linear movement. The standard yanagiba's curve, which is an advantage in the final slicing, can create inconsistency in this initial portioning — the changing geometry of the blade as it travels through the cut means that different parts of the blade are making contact at slightly different angles.

A straighter blade profiles more consistently through a long linear cut of this kind. The kiritsuke tip — flatter, more even from heel to point — can produce a more uniform contact surface when the task is the initial portioning of large blocks rather than the final precision slicing.

This is a real advantage. It is also a narrow one — specific to a particular task, in a particular context, performed by cooks at a particular level of work. For everything else that a yanagiba is used for, the standard curve remains superior.

Here is where the Yanagiba (Kiritsuke)'s geometry creates a difficulty that many users encounter and that is worth understanding before purchase.

The standard yanagiba's curved tip rises naturally away from the cutting board as the blade moves through its stroke. This clearance is built into the geometry — the curve lifts the point above the board surface, allowing the stroke to complete without the tip making unwanted contact.

The Yanagiba (Kiritsuke)'s straighter tip does not have this natural clearance. When used in a standard pulling stroke — particularly by someone accustomed to the standard yanagiba — the tip tends to contact the cutting board before the stroke is complete. The user experiences this as the knife "catching" or feeling resistant near the end of the cut, in a way that the standard yanagiba does not.

This is not a problem that cannot be managed. Experienced cooks who work with the Yanagiba (Kiritsuke) regularly develop an adjusted technique — a slightly different wrist position, a different stroke angle, a learned compensation for the tip's tendency to reach the board. But the compensation has to be learned. And in a working kitchen, where the technique of a tool should work with the cook's natural motion rather than against it, this adjustment represents an ongoing cost that the standard yanagiba does not impose.

The Yanagiba (Kiritsuke) presents a specific challenge that becomes clear when viewed from the sharpener's perspective.

The tip of a standard yanagiba — gently curved, tapering to a point — is relatively thin. This thinness is appropriate to its function: the tip does detailed work, and a thin tip is responsive and precise. It is also, because it is thin, relatively fragile. But the fragility is managed by the curve — the geometry distributes the stress of contact in a way that a straight tip does not.

The Yanagiba (Kiritsuke)'s tip appears more robust. It has more material at the point — more thickness, more mass. To the eye, and to the hand, it feels more durable than the standard yanagiba's delicate point.

The sharpener's assessment is different. The additional material at the tip means that when unusual force is applied — when the tip contacts the board at the wrong angle, or when lateral stress is applied that the geometry was not designed to absorb — the tip has more mass to transfer that stress to the blade itself. The result, in practice, is that the Yanagiba (Kiritsuke) tip can be more prone to bending, chipping, or in extreme cases, breaking, than its appearance suggests.

This is counterintuitive — the thing that looks stronger behaving, under certain stresses, in a more fragile way. It is also, for a knife at this price point and quality level, important to understand before the knife is in a working kitchen.

The Yanagiba (Kiritsuke) is more expensive than a comparable standard yanagiba in the same steel and at the same quality level. This is not a premium for prestige or rarity. It is a manufacturing reality.

The kiritsuke tip profile is produced by removing material from the standard blank — by grinding and working the blade to create the angled, flat-tipped profile that distinguishes the kiritsuke form. This additional processing adds steps to the manufacturing process, requires additional skill and time, and produces a knife that, paradoxically, has less material at the working end than the amount of work invested in shaping it would suggest.

The result is a knife that costs more to make, requires more skill to use, and demands more from the sharpener — and that, for all this investment, offers a functional advantage that is genuine but narrow. Whether that advantage justifies the additional cost and complexity is a question that depends entirely on what the knife is for and who will use it.

Here is the genuinely interesting question that the Yanagiba (Kiritsuke) raises, and that specialists in Japanese knife culture acknowledge they cannot fully answer: why does it exist in this form?

The functional case for the Yanagiba (Kiritsuke) — the advantage in long linear cuts for saku work — is real but limited. It does not obviously justify the additional manufacturing complexity, the maintenance difficulty, or the technique adjustment required to use the knife well. And yet the form exists, is made by serious craftsmen, is sought by serious cooks, and has a place in the tradition that no one has successfully challenged.

The answer that specialists offer, when pressed, is one that they acknowledge with some discomfort: it might be partly aesthetic. The kiritsuke profile is visually compelling in a way that the standard yanagiba is not. It has a sharpness of silhouette — an authority of line — that reads, to the eye, as sophistication and precision. The angled tip looks decisive. The straight profile looks disciplined.

Whether these visual qualities correspond to functional ones is, as we have seen, complicated. The knife looks like it means something specific. What it means, in use, depends on the task.

This is not a criticism. Aesthetics are not irrelevant to craft objects, and a knife that a cook finds beautiful — that they pick up with a particular feeling of rightness — is a knife they will care for and work with in a particular way. The visual dimension of a tool is part of its relationship with its user, and that relationship affects performance in ways that purely functional analysis cannot capture.

But it is worth knowing, when considering the Yanagiba (Kiritsuke), that the form's origins are uncertain — that specialists who have spent careers studying Japanese knife history cannot say with confidence who made the first one or why — and that one of the plausible explanations is simply that someone found the shape beautiful and decided to make it.

In a tradition as deliberate and as functional as Japanese knife-making, this ambiguity is itself remarkable.