1 of 3

How Japanese Knives Are Made: The Sakai Tradition

VIDEO PROVIDED: JAPAN TRADITIONAL CRAFTS AOYAMA SQUARE (YOUTUBE)

  • What’s News (Nov 19, 2025) - U.S. Tariff Update for Japanese Knives

  • A U.S. customer has reported a 50% tariff applied to a Japanese knife shipment under the expanded Section 232 measures.

    This follows the end of the USD 800 de minimis exemption on August 29, 2025.

    While KIREAJI cannot influence customs decisions, we will continue sharing verified updates to help customers make informed choices.

  • What’s News|Year-End & New Year Holiday Notice

  • Shiroyama Knife Workshop Year-End & New Year Holiday Schedule

    Our partner workshop in Sakai, Shiroyama Knife Workshop, will be closed for the year-end and New Year holidays during the following period:

    Holiday Period:
    December 30 – January 4


    During this time, production and shipping will be temporarily paused.
    Orders will continue to be accepted, and processing and shipping will resume sequentially after the workshop reopens.

    Thank you for your understanding as we respect the craftsmen’s time to rest and prepare for the year ahead.
    We appreciate your continued support of Sakai’s traditional craftsmanship.

  • KIREAJI began with 100 knives—and 100 lives behind them.

    In 2020, when the pandemic brought my in-person classes to a halt, I began sharpening knives for friends.
    One knife became ten.
    Ten became fifty.
    By the end of the year, more than one hundred knives had passed through my hands.

    Each blade told a quiet story.
    A softened edge shaped by years of meals.
    A spine worn smooth by countless hands.
    A handle polished not by machines, but by time.

    And every time I returned a knife, I heard the same question:

    “Where can I find a truly great Japanese knife?”

    That single question—and the stories carried by those hundred blades—became the beginning of KIREAJI.

    Our Story 
  •   

  • HOW — How We Protect True Japanese Craftsmanship

  • To honor those stories, we chose a single path:
    to work directly with the craftsmen themselves.


    We partnered with Shiroyama Knife Workshop in Sakai, Japan
    a city whose knives are trusted by 98% of Japan’s professional chefs.

    Source (98% data): Sakai Tourism Bureau 
  • Every KIREAJI knife is created through Sakai’s historic division-of-labor system:
    one master for forging, one for sharpening, and one for handle-making.

    Shiroyama Knife Workshop 
  • There are no middlemen.
    No distributors.
    No “Japanese-style” imitations.

    Only authentic Sakai craftsmanship
    shipped directly from the workshop to your kitchen, with complete transparency.

    Global Delivery from Sakai 
  • We also choose not to spend on advertising.
    Instead, every possible resource is returned to two places that truly matter:
    the craftsmen who create these blades,
    and the people who choose to use them.

    Through the Japanese Knife Academy,
    we share knowledge so that people around the world can understand—not just buy—real Japanese knives.

    Japanese Knife Academy 
  • Because we believe the strongest form of marketing is not advertising,
    but trust, understanding, and the voices of those who cook with our knives every day.


  • WHAT — What You Receive from KIREAJI

  • A KIREAJI knife is not mass-produced.
    It is completed after you place your order.

    Each handle is fitted by hand, and upon request, the blade receives Honbazuke
    the final hand-sharpening performed by a master craftsman.

    Made-to-order Japanese knives 
  • This is the same level of craftsmanship trusted in Japan’s finest professional kitchens
    the quality relied upon by the 98%.

    Why do 98% of Japanese Chefs Use Knives from Sakai? 
  • And because every blade deserves respect,
    we include a handcrafted wooden saya (sheath) with every order, at no additional cost.

    You don’t simply receive a knife.

    You receive a living piece of Sakai’s tradition— crafted for you, by hands carrying over six centuries of skill,
    and made to accompany you through a lifetime of cooking.

  • KIREAJI connects the world directly with Sakai’s master craftsmen.
    Born from sharpening over 100 knives, our mission is simple: protect true craftsmanship.
    By investing in artisans—not advertising—we deliver authentic, made-to-order tradition straight from the workshop to your hands.

KIREAJI's Three Promises to You

  • More Than a Knife—A Promise in Every Cut.

    At KIREAJI, every blade is born from centuries of Sakai craftsmanship, designed to serve you for a lifetime.
    Here are our three promises to every cook who chooses KIREAJI.

1. Forged in the Legacy of Sakai

From Sakai City—Japan’s renowned birthplace of professional kitchen knives—each blade is crafted by master artisans with over six centuries of tradition. Perfectly balanced, enduringly sharp, and exquisitely finished, every cut carries the soul of true craftsmanship.

Sakai Traditional Craftsmen Collection

2.Thoughtful Care for Everyday Use

Every knife includes a hand-fitted magnolia saya for safe storage. Upon request, we offer a complimentary Honbazuke final hand sharpening—giving you a precise, ready-to-use edge from day one.

KIREAJI Complimentary Services

3. A Partnership for a Lifetime

A KIREAJI knife is more than a tool—it is a lifelong companion. With our bespoke paid aftercare services, we preserve its edge and beauty, ensuring it remains as precise and dependable as the day it first met your hand.

After-Sales Service
Ōhira Natural Finishing Whetstone

Introducing the Japanese Natural Whetstone Collection

We are pleased to present the beginning of KIREAJI’s Japanese Natural Whetstone Collection—a tribute to Japan’s enduring art of sharpening.
Our first stone marks the start of this journey, carefully selected for its beauty, texture, and exceptional performance.

Each natural whetstone is unique, shaped by nature over centuries.
As we continue to listen to our customers and artisans, we will expand this collection—adding stones that embody the spirit, refinement, and quiet strength of Japanese craftsmanship.

This is just the first chapter of a collection that will continue to grow, one stone at a time.

Japanese Natural Whetstone
  • What you hold in a KIREAJI knife is only the surface of a much deeper story.

    Behind every blade lie three hidden foundations—
    the quiet forces that shape its strength, balance, and soul long before it reaches your hands.

    First, the artisans of Sakai, who devote decades to mastering their craft.
    Second, the unseen process—over 30 meticulous steps—that gives each blade its sharpness and longevity.
    Third, our commitment to fair and honest value, ensuring quality is never compromised.

    These foundations may be invisible.
    But they are the reason every KIREAJI knife feels alive in your hand.

1. It Begins with a Person – Honoring the Artisans of Sakai

  • Every KIREAJI knife begins not with a machine,
    but with a single pair of hands.

    In Sakai City, Osaka—the heart of Japanese blacksmithing for over 600 years—
    master artisans devote decades to perfecting their craft.

    With patience, precision, and pride,
    they shape steel into blades that embody both strength and soul.

    The true value of every knife lies not in the steel alone,
    but in the human spirit that creates it.

  • Shogo Yamatsuka

    A master blacksmith famed for his skill in forging rare Ginsan steel. Certified as a Traditional Craftsman in 2012, he personally handles every step from forging to sharpening, earning the trust of professional chefs worldwide.

    Shogo Yamatsuka 
  • Satoshi Nakagawa

    The youngest Traditional Craftsman in Sakai’s history, trained 16 years under master Kenichi Shiraki. Known for precision and artistry, he now leads Nakagawa Hamono, creating blades that blend tradition and innovation.

    Satoshi Nakagawa 
  • Keijiro Doi

    Master of yanagiba and mukimono usuba knives, certified as a Traditional Craftsman in 1987. Awarded the Blue Kiriba Award in 1997, he retired in 2012 and passed away in 2017, leaving rare and highly valued works.

    Keijiro Doi 
  • Tadashi Enami

    A fifth-generation blacksmith preserving ancient fire-forging while embracing innovation. Certified in 2003 and honored as a Sakai City Meister in 2007, he is renowned for meticulous craftsmanship and made-to-order knives.

    Tadashi Enami 
  • Yuzan

    A legendary craftsman who mastered Mizuyaki Honyaki, among the most difficult forging techniques. His rare works are almost impossible to find, and his legacy lives on through his son, Shogo Yamatsuka.

    Yuzan 
  • Kenichi Shiraki

    Renowned for his mastery of Honyaki and water-quenching techniques, producing knives of unmatched sharpness. Now retired, his rare works are treasured, with his legacy carried on by apprentice Satoshi Nakagawa.

    Kenichi Shiraki 
  • Tatsuo Ikeda

    Third-generation head of Ikeda Cutlery, famed for Honyaki forging and the Fuji wave pattern. Honored with the Order of the Sacred Treasure in 2009, his works remain rare treasures since his passing in 2015.

    Tatsuo Ikeda 
  • Yoshikazu Ikeda

    President of the Sakai Uchihamono Traditional Craftsmen Association and co-founder of Ikeda Tanrenjo. Certified in 1988 and awarded Osaka’s Outstanding Artisan Award in 2014, he is known for his relentless pursuit of perfection.

    Yoshikazu Ikeda 
  • Tadayoshi Yamatsuka

    Certified as a Traditional Craftsman in 2022, he is renowned for exceptional mirror-polishing skills. His beautifully finished blades captivate chefs in Japan and around the world.

    Tadayoshi Yamatsuka 
  • Shotaro Nomura

    Certified as a Traditional Craftsman in 1988, he has over 60 years of sharpening experience. Trained under the legendary Mr. Ino, he is known for knives that grow more beautiful and perform better with each use.

    Shotaro Nomura 

2. It Continues with a Process – The Hidden Craft Behind the Edge

  • From those hands, each knife passes through over 30 meticulous stages of creation.

    Forging.
    Heat treatment.
    Grinding.
    Sharpening.

    Every step matters.

    While mass production cuts corners,
    we never do.


    Because true sharpness is not born in a single moment on a whetstone—
    it is forged step by step, long before the first cut is ever made.

  • White Steel #2

    Precision at Your Command
    Made from ultra-pure carbon steel, White Steel #2 produces razor-sharp edges with ease. Exceptionally easy to sharpen and maintain, this blade is perfect for chefs who demand precision in every slice and value control in their daily work.

    White Steel #2 
  • White Steel #1

    The Ultimate Edge for Elite Chefs
    With even higher carbon content and edge retention than White Steel #2, this premium material delivers unmatched sharpness and clean, effortless cuts. For chefs who seek the ultimate in cutting accuracy and responsiveness, this is the steel of choice.

    White Steel #1 
  • Blue Steel #2

    Enduring Sharpness You Can Rely On
    Blue Steel #2 is alloyed with tungsten and chromium to boost wear resistance without sacrificing sharpness. It keeps its edge longer and handles daily use with confidence—ideal for hardworking chefs who need tools they can trust.

    Blue Steel #2 
  • Blue Steel #1

    Peak Performance with Lasting Strength
    The highest grade of Blue Steel combines high carbon content with enhanced toughness. With superior cutting performance and long-term durability, it meets the demands of professional kitchens with strength and precision.

    Blue Steel #1 
  • Super Steel (Honyaki)

    Forged Like a Samurai Sword
    Crafted from a single piece of steel and heat-treated with meticulous care, Honyaki knives are the pinnacle of Japanese bladesmithing. This Super Steel version, hand-forged in Sakai, offers unrivaled sharpness, elegance, and artisanal spirit.

    Super Steel (Honyaki) 
  • ZDP189

    Next-Gen Steel for Unmatched Performance
    Made using Hitachi’s powder metallurgy, ZDP189 is an ultra-hard stainless steel offering extreme sharpness, edge retention, and corrosion resistance. Trusted by top chefs and collectors worldwide, each knife is handcrafted for precision and excellence.

    ZDP189 
  • Ginsan

    The Sharpness of Carbon Steel, with Stainless Ease
    Ginsan steel, developed by Hitachi, delivers the keen edge of carbon steel with the convenience of stainless. Forged by master craftsmen like Shougo Yamatsuka, these blades balance sharpness, durability, and chip resistance—perfect for daily cooking with confidence.

    Ginsan 

3. Artisan Quality, Honestly Priced – Our Promise to You

  • We partner directly with renowned Sakai workshops,
    including Shiroyama Knife Workshop,
    ensuring artisans are fairly rewarded for their skill.

    By removing unnecessary middlemen,
    avoiding inflated markups,
    and investing solely in craftsmanship and quality,
    we deliver handcrafted excellence at an honest price.

    Each knife travels straight from the hands of its maker in Japan to your kitchen.

    Not just a product—
    but a living connection between tradition, craftsmanship, and you.

  • KIREAJI: The Path to Becoming a Japanese Knife Evangelist

    Becoming a Japanese Knife Evangelist begins with understanding why these blades matter.

    By learning their history, materials, and purpose, knowledge transforms into wisdom.

    Through use, that wisdom becomes lived experience—
    and with every cut, you begin to feel the heritage of Sakai’s craftsmanship in your hands.

    Finally, by sharing what you’ve learned, you spark curiosity in others,
    helping the culture thrive and ensuring these traditions reach the next generation.

  • KNOW — Discover the "Why" Behind Every Blade

  • In our Knowledge section, you explore what gives Japanese knives their soul:

    History, structure, materials, markets, and craftsmanship behind Japanese knives
    ・ The questions that lead to true understanding:

    Why are there so many types of Japanese knives?
    Why are Japanese knives single-beveled?
    Why does Japan have such a deep sharpening culture?
    Why do some knives still use carbon steel in the modern age?

    When you understand the “why,
    information stops being data and becomes wisdom.

    Knowledge 
  • USE — From Knowledge to Experience

  • Knowing is only the beginning.

    In How to Use, you learn essential techniques and care—
    before, during, and after each cut.

    With repetition, knowledge becomes muscle memory.
    And slowly, you stop thinking—and begin feeling.

    This is the moment when craftsmanship moves from the mind to the hands.

    How to Use 
  • SHARE — You Are the Next Evangelist

  • Through the Japanese Knife Academy,
    videos and quizzes spark insights you naturally want to share.

    That moment when you explain something to someone else—
    that is when the circle expands.

    Your story ignites curiosity.
    Your passion creates connection.

    You are now a Japanese Knife Evangelist—
    carrying culture forward, one conversation at a time.

    Japanese Knife Academy 

  • One Voice. A Thousand Echoes.

  • Your single step can spark a global movement.

    Tradition doesn’t merely survive.
    It thrives—because of you.

    Welcome to KIREAJI.
    Let’s carry this craft into the future, together.

  • How You Treat Your Tools Reveals Who You Are

    How You Treat Your Tools Reveals Who You Are

    This article examines how the way we treat our tools reveals our mindset, values, and responsibility. Drawing from Japanese craftsmanship and real experiences with knives, it highlights the importance of...

    How You Treat Your Tools Reveals Who You Are

    This article examines how the way we treat our tools reveals our mindset, values, and responsibility. Drawing from Japanese craftsmanship and real experiences with knives, it highlights the importance of...

  • Black Friday and the True Meaning of Value:Why Real Craftsmanship Doesn’t Go on Sale

    Black Friday and the True Meaning of Value:Why ...

    A thoughtful look at Black Friday discount culture and how it contrasts with the enduring value of handcrafted Sakai knives. Instead of seasonal sales or inflated margins, KIREAJI chooses fair...

    Black Friday and the True Meaning of Value:Why ...

    A thoughtful look at Black Friday discount culture and how it contrasts with the enduring value of handcrafted Sakai knives. Instead of seasonal sales or inflated margins, KIREAJI chooses fair...

  • Washoku Day

    Washoku Day

    This article explores the cultural meaning of Washoku Day (November 24)—a celebration of Japan’s traditional food culture, rooted in seasonality, gratitude for the harvest, and harmony with nature. It explains...

    Washoku Day

    This article explores the cultural meaning of Washoku Day (November 24)—a celebration of Japan’s traditional food culture, rooted in seasonality, gratitude for the harvest, and harmony with nature. It explains...

  • The Japanese Knife Workbook — Learn, Then Speak It Forward

    The Japanese Knife Workbook — Learn, Then Speak...

    The journey continues with The Japanese Knife Workbook—a hands-on guide designed to transform learning into expression.Through interactive quizzes, detailed explanations, and reflective practice, this book helps you embody the art,...

    The Japanese Knife Workbook — Learn, Then Speak...

    The journey continues with The Japanese Knife Workbook—a hands-on guide designed to transform learning into expression.Through interactive quizzes, detailed explanations, and reflective practice, this book helps you embody the art,...

1 of 4