KOKUYO Jibun Techo DIARY 2027: 24-Hour Weeks & Size

KOKUYO Jibun Techo DIARY 2027 in its clear cover, closed and opened on a 24-hour weekly vertical spread — The DIARY closed and open on a weekly spread, drawn to scale (1 mm = 1 px).

Product facts

Product: KOKUYO Jibun Techo DIARY 2027, A5 Slim, January start, White (with clear PVC cover)
Brand: KOKUYO
Brand origin: Japan
Made in: Japan^*
Material: KOKUYO THIN PAPER (112 sheets); clear matte PVC cover with pen holder and insert sheet
Released: September 2026^*
Price range: $$$$20–75 per notebook
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Notes on these facts

Made by KOKUYO Co., Ltd.. Made in Japan: KOKUYO's official global online store gives Country of Origin: Japan for the 2027 DIARY A5 Slim. KOKUYO's Japanese product page lists size, sheets, paper and JAN code but not the country. Source. Price: example listing. Released: KOKUYO's global store says the 2027 Jibun Techo went on sale September 4, 2026; KOKUYO's August 7, 2026 press release says from mid-September in Japan. The Jibun Techo itself has been sold since 2013.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).

Key takeaways

KOKUYO's Japanese site lists the 2027 DIARY at 217 × 136 mm (A5 Slim, about 8.5 × 5.4 in) with 112 sheets of THIN PAPER.
Monthly block pages run from November 2026 to March 2028 and weekly vertical pages from November 2026 to the second week of January 2028.
KOKUYO's list price is ¥3,800 (about US$24) before tax in White, Green or Butter Yellow; US shops put it in our $$$ band ($20–75).
The DIARY is the same book that comes in the First Kit, without the LIFE and IDEA booklets.
KOKUYO's global online store gives Japan as the country of origin.

What is the KOKUYO Jibun Techo DIARY 2027?

The Jibun Techo DIARY 2027 is KOKUYO’s dated A5 Slim planner book, sold alone in a clear PVC cover with a pen holder. “Jibun techo” means “my own planner”, and the full system splits into three books: DIARY for the year, LIFE for records you keep for life, and IDEA for notes.

KOKUYO’s global store says the DIARY sold alone is identical to the one in the Jibun Techo First Kit. Buy the DIARY if you only want the yearly planner, or if you kept last year’s LIFE and IDEA books.

KOKUYO Jibun Techo DIARY 2027 specs

Spec	Value
Size	A5 Slim, 217 × 136 mm (8.5 × 5.4 in)
Sheets	112 (224 pages)
Paper	KOKUYO THIN PAPER
Layouts	Monthly block, 24-hour weekly vertical, 2-month project (Gantt) schedule
Monthly pages	November 2026 to March 2028
Weekly pages	November 2026 to the second week of January 2028
Cover	Clear matte PVC with pen holder and insert sheet
Colors	White, Green, Butter Yellow
Item numbers	ニ-JCD1W-27 (White) · ニ-JCD1G-27 (Green) · ニ-JCD1Y-27 (Butter Yellow)
List price (Japan)	¥3,800 (about US$24) before tax
Made in	Japan

Everything except the country comes from KOKUYO’s Japanese product pages; the country of origin is from KOKUYO’s global online store.

Jibun Techo A5 Slim page, 136 by 217 mm, drawn to scale against standard A5 and B6 Slim — A5 Slim is narrower and taller than standard A5.

Jibun Techo DIARY 2027 date ranges: monthly pages November 2026 to March 2028, weekly pages to the second week of January 2028 — Monthly and weekly pages start two months before New Year.

How does the 24-hour weekly page work?

Each weekly spread shows seven day columns crossed by a full 24-hour timeline, so you can plan and log your whole day, including sleep. KOKUYO pairs it with a monthly block calendar and a two-month project schedule for longer tasks.

The global store lists the reference pages too: a three-year calendar, annual schedule, budget page, “100 things to do this year”, book, movie and gift lists, a year in review and rail maps of major Japanese cities. Months, weekdays and times are printed in English; some reference pages are only in Japanese.

Is THIN PAPER good for fountain pens?

KOKUYO says THIN PAPER resists bleed-through, feathering and show-through, and stays flat when you rub out erasable ink. It is thin so the book stays light, and KOKUYO adds that fountain pen users like it for showing ink shading.

That is the maker’s claim, and we haven’t tested the 2027 book. If you mainly write with fountain pens, KOKUYO’s Biz edition uses MIO PAPER, which its store describes as slightly thicker and softer. The Hobonichi Techo Original uses an even thinner Tomoe River paper.

Which start month and size should you choose?

The A5 Slim DIARY is the January-start book that begins in November 2026; KOKUYO also makes a smaller B6 Slim “mini”.

A5 Slim DIARY: 217 × 136 mm, the size in this guide, for desk planning.
B6 Slim mini DIARY: 190 × 120 mm, ¥3,500 (about US$22) before tax, easier to carry.
Refill without cover: ¥3,600 (about US$23) before tax, to drop into a cover you already own.

KOKUYO’s store says the Biz and Lite editions start in December and the one-day-per-page DAYs in January.

How does the Jibun Techo DIARY compare to the Hobonichi Cousin?

The Jibun Techo is a weekly planner built around time; the Hobonichi Cousin is a daily diary with weekly pages added.

	Jibun Techo DIARY 2027	Hobonichi Cousin 2027
Size	217 × 136 mm (A5 Slim)	210 × 148 mm (A5)
Main layout	24-hour weekly vertical	One page per day, plus weekly
Pages	224	544
Paper	THIN PAPER	Tomoe River S
Starts	November 2026	December 2026 (monthly)

For a page per day in a B6 book instead, see the MARK’S EDiT 2027 planner; for other 2027 options, see our best planners for 2027.

Where is the Jibun Techo DIARY made?

KOKUYO’s global online store gives Japan as the country of origin for the 2027 DIARY. KOKUYO, based in Osaka, is one of Japan’s largest stationery makers, and it has sold the Jibun Techo since 2013. Our KOKUYO history traces the company from a 1905 ledger-cover shop.

Frequently asked questions

Is the Jibun Techo DIARY the same as the First Kit?

The book is the same. KOKUYO's global store says the DIARY sold alone is identical to the DIARY in the First Kit; the kit adds the LIFE and IDEA booklets and a ruler.

When does the Jibun Techo 2027 start?

It is a January-start book with an early start: monthly pages from November 2026 and weekly pages from November 2026, so you can begin before New Year.

What was the Jibun Techo 2027 release date?

KOKUYO's global store says the 2027 Jibun Techo went on sale on September 4, 2026; KOKUYO's August 7, 2026 press release said it would reach Japanese shops from mid-September.

Is the Jibun Techo in English?

Not fully. KOKUYO's global store says there is no English-only edition of the DIARY, but months, weekdays and the 24-hour timelines are printed in English, and some reference pages are Japanese.

Can you use a fountain pen in the Jibun Techo DIARY?

KOKUYO says THIN PAPER resists bleed-through and show-through and that fountain pen users like how it shows ink shading. It is thin paper, so wet inks and broad nibs are the riskiest; we haven't tested it.

How many pages does the Jibun Techo DIARY have?

KOKUYO lists 112 sheets, which is 224 pages, for the A5 Slim DIARY.

Can I buy the DIARY without a cover?

Yes. KOKUYO sells a 2027 A5 Slim DIARY refill without a cover (ニ-JR-27) at ¥3,600 (about US$23) before tax, for people who already own a Jibun Techo cover.

Is the Jibun Techo made in the USA?

No, in Japan. KOKUYO's global online store lists Japan as the country of origin for the 2027 DIARY.

Sources (7)

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