Arts＆Science: Baby Buffalo A6 Original Size - Techo Lineup

Arts＆ScienceBaby BuffaloA6 Original Size

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

An elegant and stylish red

We designed this cover to make a high-quality red techo stylish for adults to have.

The color is a sophisticated burgundy, with different red colors on the front and the inner cover. Bright red would also be nice, but this cover would be great for those who feel uncomfortable with such a color; it is bright and gorgeous on the inside but gives a calm impression on the outside.

As with all the Arts&Science techo, the simple but neat tabs and the beautiful curves of the pocket cutouts are all very carefully crafted details.

We believe this edition’s techo has become another stylish and attractive one.

Introduction to Baby Buffalo

(Hobonichi Techo 2025 lineup)

Staff List

Photographer: Styled Images: Mihoko Sakamoto / Product Detail: Hiroyuki Oe
Stylist: Ami Kanno

Arts＆ScienceBaby BuffaloA6 Original Size

¥35,420 - ¥36,410 (incl. tax)
¥33,000 (incl. tax)

20 per item

Available

Normal

Specifications*Specifications may vary slightly

Cover

Size

H: 161 x W: 323 x T: 3 mm / H: 6.3" x W: 12.7" x T: 0.1"

Weight

Approx. 96 g

Main material

Exterior: Cow leather / Interior: Cow leather

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-Free
Monthly notebook

Planner | One-Page-Per-Day TypeEnglish

type	Monday Start (English)
Size	A6 H: 148 x W: 105 x T: 15 mm / H: 5.8" x W: 4.1" x T: 0.6" *Specifications may vary slightly
Weight	Approx. 190 g
Dates	Jan 2026 - Dec 2026

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.

Daily pages
Yearly calendar
Yearly index
Monthly calendar
Memo pages

View details on features and included content

Original | One-Page-Per-Day TypeStandard Edition (Japanese / English) / One Piece Edition (*1)

type	Monday Start (Japanese) Sunday Start (Japanese) Monday Start (English)
Size	A6 H: 148 x W: 105 x T: 15 mm / H: 5.8" x W: 4.1" x T: 0.6" *Specifications may vary slightly
Weight	Approx. 195 g
Dates	Jan 2026 - Dec 2026 (Jan start) Apr 2026 - Mar 2027 (Apr start)

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.

Daily pages
Yearly calendar
Yearly index
Monthly calendar
Memo pages

*1 Also compatible with the One Piece Edition Original Book.

View details on features and included content

Original Avec | One-Page-Per-Day Type (2-Book Set)Japanese

type	Monday Start (Japanese)
Size	A6 Each Book: H: 148 x W: 105 x T: 8 mm / H: 5.9" x W: 4.1" x T: 0.3" *Specifications may vary slightly
Weight	Each Book: Approx. 110 g
Dates	Book 1: Jan 2026 - June 2026 Book 2: July 2026 - Dec 2026

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.

Daily pages
Yearly calendar
Yearly index
Monthly calendar
Memo pages

View details on features and included content

Day-Free | Monthly Techo + NotebookJapanese

type	Monday Start (Japanese)
Size	A6 H: 148 x W: 105 x T: 8 mm / W: 4.1" x H: 5.9" x T: 0.3" *Specifications may vary slightly
Weight	Approx. 110 g
Dates	Dec 2025 - Mar 2027

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.

Monthly calendar
Yearly calendar
Yearly index
Graph paper notebook pages

View details on features and included content

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 slightly
Weight	Approx. 195 g
Language	English
Pages	464 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	3.7 mm *Monthly calendar pages are 3.45 mm
Start of Week	Monday-start week
Yearly Calendar	2025, 2026, 2027
Yearly Index	Dec. 2025 - Mar. 2027 (8 pages)
Monthly Calendar	Dec. 2025 - Mar. 2027 (32 pages)
Daily Pages	Jan. 1 - Dec. 31, 2026 (377 pages) A page is included at the beginning of each month to help in planning ahead. Every two-page spread includes one daily quote. Includes a mini monthly calendar at the bottom right of every two-page spread (Monday-start). Additionally, a blank two-page spread is featured at the beginning to provide a free area when starting out the book.
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 / Memories 2026 / 12 Switches to Help You Focus / For a Comfortable Night’s Sleep / Words to Remember / 365 Days Check-Off Sheet / Looking Back at the Year 2026 / 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 slightly
Weight	Approx. 190 g
Language	English
Pages	448 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	4 mm
Start of Week	Monday-start week
Yearly Calendar	2026, 2027
Yearly Index	Dec. 2025 - Mar. 2027 (8 pages)
Monthly Calendar	Dec. 2025 - Mar. 2027 (32 pages)
Daily Pages	Jan. 1 - Dec. 31, 2026 (377 pages) 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). Additionally, a blank two-page spread is featured at the beginning to provide a free area when starting out the book.
Daily Quotes	One quote per two-page spread (English)
Weekly Pages	Not included
Memo Pages	14 pages
Bonus Pages	Important Contacts / International Size Charts / The Ultimate Packing List / My 100 / Memories 2026 / Mochi - Japan’s Favorite Sticky Treat / Shinkansen - Travel Japan on the Bullet Train / 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 slightly
Weight	Approx. 195 g
Language	Japanese
Pages	464 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	3.7 mm *Monthly calendar pages are 3.45 mm
Start of Week	Monday-start week or Sunday-start week
Yearly Calendar	2025, 2026, 2027
Yearly Index	Dec. 2025 - Mar. 2027 (8 pages)
Monthly Calendar	Dec. 2025 - Mar. 2027 (32 pages)
Daily Pages	Jan. 1 - Dec. 31, 2026 (377 pages) 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). Additionally, a blank two-page spread is featured at the beginning to provide a free area when starting out the book.
Daily Quotes	One per day (Japanese)
Weekly Pages	Not included
Memo Pages	15 pages
Bonus Pages	Time Table / Graph Paper / Favorites / My 100 / Memories 2026 / 12 Switches to Help You Focus / For a Comfortable Night’s Sleep / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the most of Hobonichi / Gifts / Age Table / Addresses / 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 slightly
Weight	Each Book: Approx. 110 g
Language	Japanese
Pages	Each Book: 240 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	3.7 mm *Monthly calendar pages are 3.45 mm
Start of Week	Monday-start week
Yearly Calendar	2025, 2026, 2027
Yearly Index	Book 1: Dec. 2025 - Mar. 2027 (8 pages) Book 2: Jun. 2026 - May 2027 (6 pages)
Monthly Calendar	Book 1: Dec. 2025 - Jul. 2026 (16 pages) Book 2: Jun. 2026 - Jan. 2027 (16 pages)
Daily Pages	Book 1: Jan. 1 - June 30, 2026 (187 pages) Book 2: July 1 - Dec. 31, 2026 (190 pages) 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). Additionally, 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.
Daily Quotes	One per day (Japanese)
Weekly Pages	Not included
Memo Pages	Book 1: 2 pages Book 2: 0 pages
Bonus Pages	Time Table / Graph Paper / Favorites / My 100 / Memories 2026 / 12 Switches to Help You Focus / For a Comfortable Night’s Sleep / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the most of Hobonichi / Gifts / Age Table / Addresses / 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 October 1

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 slightly
Weight	Approx. 195 g
Language	Japanese
Pages	464 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	3.7 mm *Monthly calendar pages are 3.45 mm
Start of Week	Monday-start week
Yearly Calendar	2025, 2026, 2027
Yearly Index	Dec. 2025 - Mar. 2027 (8 pages)
Monthly Calendar	Dec. 2025 - Mar. 2027 (32 pages)
Daily Pages	Jan. 1 - Dec. 31, 2026 (377 pages) 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.110) Additionally, a blank two-page spread is featured at the beginning to provide a free area when starting out the book.
Daily Quotes	One per day (Japanese / One Piece edition)
Weekly Pages	Not included
Memo Pages	12 pages
Bonus Pages	One Piece Chronology / One Piece Trivia You’ll Want to Share Tomorrow / The Fluffy Animal Encyclopedia of One Piece / WANTED / Time Table / Favorites / My 100 / Solar Terms / Emergency Preparedness / Gifts / Age Table / Addresses / 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 slightly
Weight	Approx. 110 g
Language	Japanese
Pages	240 pages
Paper Type / Binding	Thin, light Tomoe River paper that is smooth to write on and designed for planners / Stitch-binding
Graph Paper Size	3.7 mm *Monthly calendar pages are 3.45 mm
Start of Week	Monday-start week
Yearly Calendar	2025, 2026, 2027
Yearly Index	Dec. 2025 - Mar. 2027 (8 pages)
Monthly Calendar	Dec. 2025 - Mar. 2027 (32 pages)
Daily Quotes	Included (Japanese)
Graph Paper	171 pages
Bonus Pages	Time Table / Graph Paper / Favorites / My 100 / Memories 2026 / 12 Switches to Help You Focus / For a Comfortable Night’s Sleep / Solar Terms / Emergency Preparedness / Conversion Chart / Getting the Most of Hobonichi / Gifts / Age Table / Addresses / 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

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.

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Please Read Before You Buy

We’ve compiled a list of warnings, potential issues, and tips to keep in mind for this particular product. Additionally, the color of the product may be slightly different in actuality than compared to how it appeared on a computer or smartphone screen.

About the pen hook: The pen hook of this cover is designed to hold a pen by its clip.

Leather may contain preexisting wrinkles and marks: In order to allow customers the enjoyment of all-natural leather, the leather is processed in a way that retains its original feel. This may leave imperfections visible on the surface of the cover, such as wrinkles, scratches, stains, or vein marks.
Depending on the conditions in which the cover is used, natural oils of the leather may emerge and appear as stains. We ask for your understanding for these naturally-occurring characteristics of genuine leather.

Each leather piece has a unique look: This product uses leather with a highly distinctive character. The appearance of the leather varies depending on which part of the hide is used, so each item will have a one-of-a-kind expression. Please note that the pattern or texture may differ from what is shown in the product images.

Color transfer may occur due to friction, pressure, or moisture: Color may transfer to other items through friction or prolonged contact. This risk increases when the cover is exposed to water or sweat, so please take extra care when carrying it near clothing or other belongings.