Detective ConanCase Closed!A5 Cousin Size
- JAPAN ONLY
This product is available for shipment within Japan only.
International shipping is not available.
This collaboration brings the world of Detective Conan, the popular mystery manga serialized in Weekly Shonen Sunday, to the Hobonichi Techo.
Write down the day’s events, and the moment you fasten the cover’s button... “Case Closed!” Designed with a classical look inspired by the British detective attire that Conan admires, this cover is ready for your cases, romance, and memories. It’s a “Life Book” just for you, to spend every day with. 
The cover is a trifold type that closes with a snap button. It features a retro British-style plaid pattern and a commemorative name tag logo representing the collaboration between Detective Conan and the Hobonichi Techo. 
The pen hook inside the cover is designed to hold a pen by its clip. 
Inside the cover, numerous famous scenes selected from Detective Conan are lined up. The two bookmarks come in blue and red, inspired by Conan’s jacket and bow tie. 
There are even more original illustrations hidden in the sleeves where you insert the techo book. Be sure to take a peek to see what pictures are inside. 
We also created a pocket featuring the familiar keyhole motif found on the back covers of the comics. If you insert your favorite card or photo, its face will peek out through the keyhole. 
The pocket features a quote that appears frequently in the original work, stamped in gold foil: “When you have eliminated the impossible, whatever remains, however improbable, must be the truth.” 
The Detective Conan lineup includes not only the techo but also stationery and accessories suitable for various scenes. Why not carry famous scenes from Detective Conan with you on items designed for daily use?
© Gosho Aoyama/Shogakukan
Staff List
- Photographer
- Styled Images: Nobuki Kawaharazaki / Product Detail: Hiroyuki Oe
- Stylist
- Haruka Kimura
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- ¥8,910 - ¥10,560
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- ¥16,720 - ¥18,370
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- January-start
- JPN/ENG
- ¥9,240 - ¥10,890
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- January-start
- JPN/ENG
- ¥8,910 - ¥10,560
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- January-start
- JPN/ENG
- ¥10,560 - ¥12,210
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- January-start
- JPN/ENG
- ¥7,920 - ¥9,570
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- January-start
- JPN/ENG
- ¥7,370 - ¥9,020
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- January-start
- JPN/ENG
- ¥13,970 - ¥15,620
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- January-start
- JPN/ENG
- ¥23,320 - ¥24,970
- ¥19,800
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- January-start
- JPN/ENG
- ¥20,020 - ¥21,670
- ¥16,500
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- ¥2,750
Specifications*Specifications may vary slightly
- Cover
Size H: 228 x W: 444 x T: 3 mm / H: 9" x W: 17.5" x T: 0.1" Weight Approx. 227 g Main material Exterior: Polyester, Polyurethane / Interior: PU, Polyester Compatible Techo Books 
Cousin (A5)
1 page per day
Cousin Avec (A5)
1 page per day 6-month book
Day-Free
Monthly notebook
Cousin | One-Page-Per-Day TypeJapanese / English
type Monday Start (Japanese)
Monday Start (English)Size A5
H: 210 x W: 148 x T: 18 mm /
H: 8.3" x W: 5.8" x T: 0.7"
*Specifications may vary slightlyWeight Approx. 445 g Dates Jan 2027 - Dec 2027 (Jan start)
Apr 2027 - Mar 2028 (Apr start)- A daily techo with lots of space to write
- This A5-size techo provides ample space on each daily page. It’s great for keeping in one place at home or at work and you can use it to track your child’s growth or exchange with someone.
- Daily pages
- Yearly calendar
- Yearly index
- Monthly calendar
- Weekly pages
- Memo pages
Cousin Avec | One-Page-Per-Day Type (2-Book Set)Japanese
type Monday Start (Japanese) Size A5
Each Book: H: 210 x W: 148 x T: 10 mm /
H: 8.3" x W: 5.8" x T: 0.4"
*Specifications may vary slightlyWeight Each Book: Approx. 260 g Dates Book 1: Jan 2027 - June 2027
Book 2: July 2027 - Dec 2027- 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
- Weekly pages
- Memo pages
Day-Free | Monthly Techo + NotebookJapanese
type Monday Start (Japanese) Size A5
H: 210 x W: 148 x T: 8 mm /
H: 8.3" x W: 5.8" x T: 0.3"
*Specifications may vary slightlyWeight Approx. 220 g Dates Dec 2026 - Mar 2028 - 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
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.
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.