Community & Support
-Membership Services-
About KOKU Membership
By joining KOKU membership, you can enjoy the following benefits:

Membership Card
Issuance

Expert advice on
knife-related questions

Discounts on sharpening
and engraving

2nd floor cafe discount

Various class discounts

Member community
participation
About After-Sales Service
Sharpening Prices
Member Price
General Price
Home Knife (Santoku-Petty) 120mm~210mm
Bull Knife 240mm~330mm
Yanagiba 210mm~330mm
Out Edge 105mm~240mm
Thin Edge 195mm~240mm
Chinese Cleaver
Slicer
750円
1,120~1,870円
1,400~2,800円
1,400~2.800円~
1,870~3.270円~
1,400円
2,800~4,670円
880円
1,320~2,200円
1,650~3,300円
1,650~3.300円~
2,200~3,850円~
1,650円
3,300~5,500円
Chip Damage Repair Prices
Member Price
General Price
1mm chip damage
3mm or less chip damage
More than 3mm chip damage
基本工賃に含む
+330円(税込)〜
+550円(税込)〜
基本工賃に含む
+330円(税込)〜
+550円(税込)〜
Sharpening & Maintenance Methods
Sharpening Method
※For double-edged knives

1
Prepare the whetstone. Some whetstones need to be soaked in water, others just need water sprinkled on them. Place the whetstone on a wet cloth or stand to prevent it from moving.

2
Face the knife blade toward yourself, position at 45 degrees to the whetstone, place your fingers on the knife, lift the back (spine) of the knife, and maintain a 15-degree angle with the whetstone.

3
While maintaining the 15-degree angle, when the blade faces you, apply slight pressure when pushing and release pressure when pulling, moving your fingers and sharpening to the blade tip.

4
When you feel a burr with your fingertip, one side is complete.

5
Now switch hands, turn the blade away from you and sharpen the other side. This time, release pressure when pushing and apply slight pressure when pulling.

6
When you feel a burr with your fingertip as before, sharpening is complete.

7
Finally, remove the burr from both sides with newspaper, and wipe off moisture thoroughly.
Maintenance

1
After use, wash with a soft sponge and neutral kitchen detergent, rinse well with water, wipe off moisture and dry before storing.

2
Especially for steel, leaving salt or acid-containing dirt or storing in humid places for long periods can cause rust. After cutting pickles or lemons, wash off dirt promptly.

3
Sharpen at least 2-3 times per year to maintain good sharpness. However, serrated knives like slicers cannot be resharpened due to their structure.

4
If rust occurs, wash with cleanser on a sponge or resharpen with a whetstone. Hard scrubbers like steel wool may cause scratches.

5
Especially steel knives rust easily, so after use, wash, dry, and finally apply camellia oil or blade oil (vegetable-based oil) to prevent rust.

6
Do not put in microwave or dishwasher. (Some all-stainless knives that are dishwasher-safe are exceptions.)

About Various Customizations
Your preferred handle and knife sharpness can be customized as your unique original knife, one of a kind in the world.