Keep it All

CHAPTER: A Modern Japanese Cup Optimized for Tea at Your Desk (US$73〜)

Good work starts with a good break. CHAPTER is a modern take on the traditional Japanese tea cup, made for the work from home era and designed to last one hundred years.

watch_later Finished

CHAPTER is the Most Optimized Cup for Sencha Tea at Your Desk

1.Good work starts with a good break. Take a break with CHAPTER, a cup that brings an authentic Japanese tea-experience to your desk.

2.CHAPTER is a beautiful, minimalist, all-in-one design ceramic cup specifically designed for Japanese tea, that will also last you 100 years.

3.CHAPTER comes with packs of select Japanese tea, so you can concentrate or relax right out of the box.

→See Details on Crowdfunding Project

A Modern, yet Traditional Tea Cup

We designed CHAPTER to be functional, minimal, and aesthetically fit both Asian and Western rooms.

With the lid on, it’s sleek and modern. 

With the lid off, it’s a recognizable, traditional tea cup.


Made Without a Finish, yet Stain-Resistant and Durable

CHAPTER is made without a finish, meaning there is no final coating to protect the base layer. Usually tea cups without finish are not very stain-resistant.

However, made via Tajimi-jime—a high-temperature firing process that Maruasa Porcelain Factory takes pride in— CHAPTER is sturdy and stain-resistant.

CHAPTER has a measuring line that indicates the exact amount of hot water needed is added inside the cup with edge processing. This line can only be added on cups without finish.

Inside Line: with this line, you can pour the exact amount of hot water (180ml) for a single tea bag serving, as recommended by Minocamo Chaho.


What is Tajimi-jime?

Tajimi-jime is a Firing Method that Produces Durability in Commercial Tableware

Tajimi-jime is a technique called “reduction firing.” It involves firing unglazed ceramics at temperatures of 1,300°C (2,372°F ) for 24 hours in a kiln with very low oxygen.

Household tableware sold at general stores is made by oxidation firing. These two techniques are quite different in stain resistance and durability.

Reduction firing requires more in cost and labor, but we chose it because Maruasa Porcelain Factory aims to be the world’s top OEM that lives up to any demands.

Maruasa Porcelain Factory’s shuttle kiln. The porcelain is set onto mobile carts that are then loaded into the kiln.


The Clay Chosen for Tajimi-jime

The material used in this product is a type of high-quality clay chosen to bring out the best qualities of reduction firing. This type of clay also has a high density that cannot implement the Tajimi-jime process without a taut molding technique.

This clay was personally chosen by Director Matsubara after much experimentation and is used to bring out the great qualities of Tajimi-jime. This is the clay used for CHAPTER, and it makes it even more difficult for tea stains and other pigments to transfer.

CHAPTER is a product brought to life by a combination of handpicked clay, the Maruasa Porcelain Factory’s skilled artisans, and Tajimi-jime. Almost no manufacturers exist in Japan today that can make cups this durable from unglazed ceramic.

Sencha Tea and Work

Various flavors—astringency, bitterness, savoriness, and sweetness—can all be found in Japanese tea.

The same caffeine that gives tea its bitter flavor is also found in coffee and energy drinks. Many people wake themselves up with a cup of coffee before the start of their workday. 

Sencha (Japanese green tea) has the highest caffeine content next to gyokuro out of all the Japanese tea available and is the best for when you want to concentrate on work. Caffeine is particularly easy to extract in a short amount of time at high temperatures, so a warm cup of sencha is something you’ll love to have in your working environment.

Furthermore, theanine—the compound that gives tea its great taste—is an amino acid not found in any other plant. This compound makes tea great for creating a relaxing atmosphere.

Whether you want to relax or stay concentrated, you can introduce a great break to your everyday remote working life with sencha!


How to Use CHAPTER

STEP 1: Pour

Pour hot water to the line in the cup. The line measures the ideal amount of water (180ml) for a single tea bag serving.

STEP 2: Put In

Be sure to put the tea bag in the cup after pouring the hot water. You can better draw out the flavor by pouring in hot water first, then letting it cool slightly.

Sencha will quickly become bitter and tart when steeped at high temperatures. On the other hand, it becomes easier to extract theanine, its flavor compound, once the hot water has cooled.

STEP 3: Steep

Replace the lid and wait for one minute. At this time, it’s perfectly safe for you to move your cup to your desk with the lid on.

STEP 4: Remove and Set Aside

Dunk your tea bag up and down two or three times to extract the tea. Set the tea bag aside on the removed lid. With this lid, you won’t need to rush or worry about finding a plate to set your tea bag!

It’s ready. Introduce sencha tea into your workspace.

During a pause in your work, get up from your chair, brew some tea, enjoy the aroma that blankets your senses.

Feel free to brew a second cup once you’ve fully enjoyed a good break that refreshes all five senses.


Three Color Variations 

Clear Grey is a subtle color created from a reaction between the iron in clay and clear glaze. 

The second color is a coarse Matte Black. 

Clay Beige utilizes the Tajimi glazing technique that fires unglazed ceramics at high temperatures. These are the three colors we use.

All color variations have an unglazed inside that brings out the inherent flavor of the clay.


Clear Grey

This is a color unique to this product that can only be created by the pairing of this clay and clear glaze. The exterior’s porcelain-like luster and the inside’s raw texture create a charming contrast.


Matte Black

This is a calming hue without any shine. The rough texture of the cup is due to the fact that it’s unglazed and allows the user to feel the clay, feel the earth that these cups were made of.


Clay Beige

This cup embodies the feature of unglazed ceramics that is specific to Tajimi both inside and out. You’ll be able to enjoy the changes in its surface as it ages with use.



Specifications and Precautions

Front (with logo)

Back (without logo)


Lid on: D 76mm x H 110mm

Yunomi Cup: D 76mm x H 82mm

Lid: D 76mm x H 28mm

Quantity: Approx. 180ml (when poured to the inside line)


Material: Porcelain (no water absorbency)

Microwavable and dishwasher safe (*Please note that this product may collide into and damage other tableware in the dishwasher.)

Oven-safe up to 200℃ (392°F)



CHAPTER may vary slightly as a finished product due to the characteristics of the material and manufacturing process.

① Faded or blurred logo print

White circles may appear in the logo because of the process that prints the logo onto the clay.

② What appears to be a flaw in the Clay Beige cup

Clay molecules will collide into one another when fired unglazed at high temperatures that may result in dents and bulges as seen pictured. This does not mean it is a defective product nor flawed.

③ Color changes on Clay Beige

Changes in color (mainly black, orange, and white) may appear as pictured above due to a chemical reaction that occurs when the clay is fired unglazed at high temperatures. This does not mean it is a defective product nor a stain.

④ Difference in glazes on Matte Black and Clear Grey

There may appear to be a gap forming due to the combination of the body and lid. This is because of a process that involves applying glaze only just to the line without getting it inside the lid or body of the cup. This application process is done entirely by hand. Please understand that not all products will be the same as the way the glaze is applied will result in individual differences.

⑤ Airtightness

This product is not completely airtight. Since it is a yunomi cup and its lid, please understand that it is not meant to be used as an airtight storage container. A slight slack is formed when this type of shape is made into a ceramic. The lid, however, is made into a shape that locks into the cup so, although it won’t be airtight, it can be placed on the cup without any slide by matching up the centers.

⑥ Transportability with hot water

This product is different from a double-walled glass cup as it will become very cold or hot depending on the temperature of the beverage inside. Please regard it the same as a normal porcelain cup when it comes to temperature changes. It will become extremely hot when freshly boiled water is poured inside, so please express sufficient caution when transporting. The inside of the cup will have a line that measures the exact amount of water for one cup of tea. Once hot water has been poured to the indicated line, we suggest holding the cup above the line when transporting.