Arts&ScienceBaby BuffaloA6 Original Size
- 2025 New
This cover is produced by Arts&Science, a brand and shop led by Sonya Park, who is also the creative director of the Hobonichi Techo Planner.
The leather for this edition is fine and smooth buffalo leather. It is made by a “semi-chrome process,” combining the advantages of tannin for durability and chromium for flexibility. 
The cover is deep burgundy, and the inner cover is a brighter, vivid red. This allows you to enjoy the two different nuances when the techo is closed and when it is open. 
It is a trifold type with a magnet and a tab as an accent to the design, making it easy to open the techo. 
Inside the cover is a pocket where you can tuck in items you want to carry with your techo. The front is stamped with the logos of Arts&Science and Hobonichi. 
It also includes a hook that can hold a pen by its clip. 
The bookmark is kept simple and uses the same leather as the cover. 
The longer you use it, the more beautiful the luster becomes. We hope you enjoy the change over time. 
*How the leather ages will differ based on usage, time, and its environment.
*We also have the Planner, the full-English version of the book, directed by Sonya Park. It features an ingenious design, including bonus pages exclusive to the book. 
*This cover is also available as an Arts&Science exclusive kip leather (cowhide) with a paint finish.
The Hobonichi Techo leather covers are made with all-natural materials that have their own unique appearance. Every leather cover is a one-of-a-kind, all-natural product, so you can feel good knowing your cover is the only one like it in the world. Here are some of the unique characteristics you can expect to find.
- Markings that naturally occur during an animal’s life:
Wrinkles, veins, texture, and scratches
- Characteristics from the manufacturing process of natural leather:
Dark spots (occurs when components of the leather are exposed to iron in the air during the tanning and dyeing process)
About Arts&Science
Arts&Science is a store and brand headed by creative director Sonya Park. Launched in 2003, they now have stores in Tokyo, Kamakura, Kyoto, and Fukuoka under various concepts.
The stores feature a wide variety of items such as original clothing, home goods designed to make your time at home more fulfilling, everyday items, artist collections, and even in the field of food. The stores also occasionally host exhibitions and projects.
Arts&Science Website
Introduction to Baby Buffalo
(Hobonichi Techo 2025 lineup)
Staff List
- Photographer
- Styled Images: Mihoko Sakamoto / Product Detail: Hiroyuki Oe
- Stylist
- Ami Kanno
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- Arts&ScienceBaby BuffaloA6 Original Size
- ¥35,200 - ¥36,190(incl. tax)
- ¥33,000(incl. tax)
Compatible Techo Books
Planner (A6)1 page per day English edition
Original (A6)1 page per day
Original Avec (A6)1 page per day 6-month book
Day-FreeMonthly notebook
[Planner] Daily Pages (English Version)
- The English-version daily techo with a refined design
- This compact A6 size techo has spacious daily pages and a simple graph-paper design that offers plenty of freedom to draw, paste, and write.
- Monday-start
- A6 size
- Thickness: 15 mm (0.6”)
- Daily pages
- Yearly calendar
- Yearly index
- Monthly calendar
- Memo pages
[Original] Daily Pages・One Piece Edition (*1)
- A classic easy-to-use techo
- This compact A6 size techo has spacious daily pages and a simple graph-paper design that offers plenty of freedom to draw, paste, and write.
- Monday-start
- Sunday-start
- A6 size
- Thickness: 15 mm (0.6”)
- Daily pages
- Yearly calendar
- Yearly index
- Monthly calendar
- Memo pages
*1 Also compatible with the One Piece Edition Original Book.
[Original Avec] Daily Pages (2-Book Set)
- Each 6-month daily techo is thin and light for easy carry
- This techo splits the year into two 6-month books, making it easy to carry while keeping the same page design and layout as the standard edition.
- Monday-start
- A6 size
- Thickness: 8 mm (0.3”) each
- Daily pages
- Yearly calendar
- Yearly index
- Monthly calendar
- Memo pages
[Day-Free] Monthly Techo + Notebook
- A monthly notebook with undated pages to write freely
- This techo starts with monthly calendars and ends with undated graph paper pages so you can write whenever you want, and as much as you want.
- Monday-start
- A6 size
- Thickness: 8 mm (0.3”)
- Monthly calendar
- Yearly calendar
- Yearly index
- Graph paper notebook pages
Specifications
- Cover
Size H: 161 x W: 323 x T: 3 mm / H: 6.3" x W: 12.7" x T: 0.1"
*Specifications may vary slightlyWeight Approx. 96 g Main material Exterior: Cow leather / Interior: Cow leather 
- Book (Original English Edition / English / January Start)
Size A6 size
H: 148 x W: 105 x T: 15 mm / H: 5.8"" x W: 4.1"" x T: 0.6""
*Actual book size may vary slightlyWeight Approx. 195 g Language English Pages 464 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 3.7 mm
*Monthly calendar pages are 3.45 mmStart of Week Monday-start week or Sunday-start week Yearly Calendar 2024, 2025, 2026 Yearly Index Dec. 2024 - Mar. 2026 (8 pages) Monthly Calendar Dec. 2024 - Mar. 2026 (32 pages) Daily Pages Jan. 1 - Dec. 31, 2025 (377 pages)
*A blank two-page spread is featured at the beginning to provide a free area when starting out the book.
*A page is included at the beginning of each month to help in planning ahead.
*All daily pages include daily quotes.
*Includes a mini monthly calendar at the bottom right of every two-page spread (Monday- / Sunday-start).Daily Quotes One quote per two-page spread (English) Weekly Pages Not included Memo Pages 17 pages Bonus Pages Time Table / Graph Paper / Favorites / My 100 / Sample Symbols and Icons / How to Have Fun Keeping a Diary / Oodles of Noodles / Words to Remember / 365 Days Check-Off Sheet / Looking Back at the Year 2025 / Getting the Most Out of Your Hobonichi Techo / Gifts / Addresses / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars / Moon phase (daily pages include every phase, monthly calendars only include full and new moon) Other See the Exploring Each Type page for more details - Book (Planner / English / January Start)
Size A6 size
H: 148 x W: 105 x T: 15 mm / H: 5.8"" x W: 4.1"" x T: 0.6""
*Actual book size may vary slightlyWeight Approx. 190 g Language English Pages 448 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 4 mm Start of Week Monday-start week Yearly Calendar 2025, 2026 Yearly Index Dec. 2024 - Mar. 2026 (8 pages) Monthly Calendar Dec. 2024 - Mar. 2026 (32 pages) Daily Pages Jan. 1 - Dec. 31, 2025 (377 pages)
*A blank two-page spread is featured at the beginning to provide a free area when starting out the book.
*A page is included at the beginning of each month to help in planning ahead.
*Every two-page daily page spread includes one daily quote.
*Includes a mini monthly calendar at the bottom right of every two-page spread (Monday-start).Daily Quotes One quote per two-page spread (English) Weekly Pages Not included Memo Pages 16 pages Bonus Pages Important Contacts / International Size Charts / The Ultimate Packing List / My 100 / How to Have Fun Keeping a Diary / Oodles of Noodles / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars and daily pages) / Moon phase (daily pages include every phase, monthly calendars only include full and new moon) Other See the Exploring Each Type page for more details - Book (Original / Japanese / January Start)
Size A6 size
H: 148 x W: 105 x T: 15 mm / H: 5.8" x W: 4.1" x T: 0.6"
*Actual book size may vary slightlyWeight Approx. 195 g Language Japanese Pages 464 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 3.7 mm
*Monthly calendar pages are 3.45 mmStart of Week Monday-start week or Sunday-start week Yearly Calendar 2024, 2025, 2026 Yearly Index Dec. 2024 - Mar. 2026 (8 pages) Monthly Calendar Dec. 2024 - Mar. 2026 (32 pages) Daily Pages Jan. 1 - Dec. 31, 2025 (377 pages)
*A blank two-page spread is featured at the beginning to provide a free area when starting out the book.
*A page is included at the beginning of each month to help in planning ahead.
*All daily pages include daily quotes.
*Includes a mini monthly calendar at the bottom right of every two-page spread (Monday- / Sunday-start).Daily Quotes One per day (Japanese) Weekly Pages Not included Memo Pages 15 pages Bonus Pages Time Table / Graph Paper / Favorites / My 100 / Sample Symbols and Icons / How to Have Fun Keeping a Diary / Recommended Noodle List of 47 Prefectures / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the most of Hobonichi / Gifts / Age Table / Addresses (for 6 people) / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars) / Old lunar calendar / Rokuyo (traditional Japanese lunisolar calendar) (listed on monthly calendars) / Solar terms / Japanese holidays / Moon phase (daily pages include every phase, monthly calendars only include full and new moon) Other See the Exploring Each Type page for more details - Book (Original Avec / Japanese / January Start / 2-Book Set)
Size A6 size x 2 books
Each Book: H: 148 x W: 105 x T: 8 mm / H: 5.9"" x W: 4.1"" x T: 0.3""
*Actual book size may vary slightlyWeight Each Book: Approx. 110 g Language Japanese Pages Each Book: 240 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 3.7 mm
*Monthly calendar pages are 3.45 mmStart of Week Monday-start week Yearly Calendar 2024, 2025, 2026 Yearly Index Book 1: Dec. 2024 - Mar. 2026 (8 pages)
Book 2: Jun. 2025 - May 2026 (6 pages)Monthly Calendar Book 1: Dec. 2024 - Jul. 2025 (16 pages)
Book 2: Jun. 2025 - Jan. 2026 (16 pages)Daily Pages Book 1: Jan. 1 - June 30, 2025 (187 pages)
Book 2: July 1 - Dec. 31, 2025 (190 pages)
*A blank two-page spread (three pages for Book 2) is featured at the beginning to provide a free area when starting out the book.
*A page is included at the beginning of each month to help in planning ahead.
*All daily pages include daily quotes.
*Includes a mini monthly calendar at the bottom right of every two-page spread (Monday-start).Daily Quotes One per day (Japanese) Weekly Pages Not included Memo Pages Book 1: 2 page
Book 2: 0 pageBonus Pages Time Table / Graph Paper / Favorites / My 100 / Sample Symbols and Icons / How to Have Fun Keeping a Diary / Recommended Noodle List of 47 Prefectures / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the most of Hobonichi / Gifts / Age Table / Addresses (for 6 people) / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars) / Old lunar calendar / Rokuyo (traditional Japanese lunisolar calendar) (listed on monthly calendars) / Solar terms / Japanese holidays / Moon phase (daily pages include every phase, monthly calendars only include full and new moon) Other See the Exploring Each Type page for more details - Book (Original - One Piece Edition / Japanese / January Start) *On sale Oct 1
Size A6 size
H: 148 x W: 105 x T: 15 mm / H: 5.9"" x W: 4.1"" x T: 0.6""
*Actual book size may vary slightlyWeight Approx. 195 g Language Japanese Pages 464 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 3.7 mm
*Monthly calendar pages are 3.45 mmStart of Week Monday-start week Yearly Calendar 2024, 2025, 2026 Yearly Index Dec. 2024 - Mar. 2026 (8 pages) Monthly Calendar Dec. 2024 - Mar. 2026 (32 pages) Daily Pages Jan. 1 - Dec. 31, 2025 (377 pages)
*A blank two-page spread is featured at the beginning to provide a free area when starting out the book.
*A page is included at the beginning of each month to help in planning ahead.
*All daily pages include daily quotes.
*All daily pages include character names of those who celebrate their birthday that day (as of Vol.107)Daily Quotes One per day (Japanese / One Piece edition) Weekly Pages Not included Memo Pages 14 pages Bonus Pages One Piece Chronology / Phrases from One Piece to use when it counts / Ten great scenes chosen by readers to read over and over again / WANTED / Timetable / Favorites / My 100 / Solar Terms / Emergency Preparedness / Gifts / Age Table / Addresses (for 6 people) / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars) / Old lunar calendar / Rokuyo (traditional Japanese lunisolar calendar) (listed on monthly calendars) / Solar terms / Japanese holidays / Moon phase (daily pages include every phase, monthly calendars only include full and new moon) - Book (Day-Free A6 size / Japanese / Monthly)
Size A6 size
H: 148 x W: 105 x T: 8 mm / W: 4.1"" x H: 5.9"" x T: 0.3""
*Actual book size may vary slightlyWeight Approx. 110 g Language Japanese Pages 240 pages Paper Type / Binding Thin, light Tomoe River paper resistant to bleeding and designed for planners / Stitch-binding Graph Paper Size 3.7 mm
*Monthly calendar pages are 3.45 mmStart of Week Monday-start week Yearly Calendar 2024, 2025, 2026 Yearly Index Dec. 2024 - Mar. 2026 (8 pages) Monthly Calendar Dec. 2024 - Mar. 2026 (32 pages) Daily Quotes Included (Japanese) Graph Paper 171 pages Bonus Pages Time Table / Graph Paper / Favorites / My 100 / Sample Symbols and Icons / How to Have Fun Keeping a Diary / Recommended Noodle List of 47 Prefectures / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the most of Hobonichi / Gifts / Age Table / Addresses (for 6 people) / Personal Notes Listed Information Day of the year / Week of the year (listed on monthly calendars) / Old lunar calendar / Rokuyo (traditional Japanese lunisolar calendar) (listed on monthly calendars) / Solar terms / Japanese holidays / Moon phase (Full and new moon listed on monthly calendars) Other See the Exploring Each Type page for more details
Please Read Before You Buy
In order to provide you with the most satisfaction for your product, we've compiled a list of warnings, potential issues, and tips to keep in mind for this particular product. Please be sure to read this information carefully before placing your order.
- Actual specifications may vary from listing
Each item is individually assembled and sewn by hand by a factory worker. Best efforts are made to ensure consistent sizes and specifications, but there may be slight differences.
- Leather may contain visible wrinkles, scratches, stains, or vein marks.
This product uses delicate leather that accentuates the natural qualities of the material There may be unavoidable marks in the leather that occurred during the manufacturing process. There also may be original imperfections visible on the surface of the leather, such as wrinkles, scratches, stains, or vein marks. We ask for your understanding for these naturally-occurring characteristics of genuine leather, and hope you enjoy the material as these imperfections come to stand out less over time.
- Leather coloring stains
Dyed leather products tend to leave stains. Please be careful not to allow the leather to adhere or rub against other objects such as clothing or other belongings, especially if the bag is wet from water or sweat from your hands.
- Avoid storing in hot and humid places
Please avoid storing your product in hot, humid places or placing it atop other objects for long periods of time as this may result in lower quality and color stains.
- Pencil Board recommended during use
If you feel the metal fittings are in the way, we recommend writing over a pencil board.
- About the surface finish
The pen body has been processed to have a matte finish. After prolonged use or strong rubbing with a cloth, the matte finish may fade and become glossy. The matte finish may also come off if it comes in contact with certain chemicals, such as alcohol.
- Immediately dry if it gets wet
Immediately dab your product with a dry cloth if it gets wet. Avoid drying it with high temperatures, and place it in a well-ventilated place in the shade.
User recommendations
If you’ve used any of these products, we welcome your notes on what you like about them or what led you to buy them so we can share it with customers who are currently considering these products. We’d also love to welcome comments from customers who purchased their techo outside the Hobonichi Store or received their book as a gift.