Anime "Assassination Classroom" x KARATZ
※The purchase bonus postcard is no longer available.
About the Pop-up Store
Period: Saturday, March 14, 2026 - Thursday, March 19, 2026
Location: KARATZ Pop-up Store in Shinjuku Marui Annex 2F
※Starts on Saturday, March 14th.
Business Hours
Weekdays: 11:00 AM - 8:00 PM
Weekends and Public Holidays: 10:30 AM - 7:00 PM
※On Thursday, March 19th, it will be open until 5:30 PM
※On weekends, public holidays, and Thursday, March 19th, the hours will differ from Shinjuku Marui Annex's regular business hours.
【Available Items】
・Exhibition and in-store stock sales of the second collaboration jewelry series
・In-store stock sales of new original merchandise
※The second collaboration jewelry series will only be sold in-store at the event venue while supplies last. Available sizes are 11, 12, 13, and 14 only. (Akabane Karma model is only available in sizes 11 and 13.)
・Exhibition and pre-order sales of the first collaboration jewelry series
※Once merchandise and jewelry are out of stock in-store, they will only be available for purchase online.
※At the pop-up venue, you can try on jewelry, measure ring sizes, and place orders in-store.
【Purchase Limits】
※For the second collaboration jewelry series (in-stock sales), purchases are limited to one item per character per transaction.
【Notes】
※For operational safety, we may distribute numbered tickets for entry. The distribution times for numbered entry tickets may change as appropriate.
About Online Orders
Sales Period
Saturday, March 14, 2026, 10:00 PM - Sunday, May 10, 2026
Estimated Delivery Date for Merchandise
・Purchases made by March 31, 2026: Scheduled for delivery around the end of April 2026
・Purchases made by May 10, 2026: Scheduled for delivery around early June 2026
※Some items may take longer to deliver depending on production and arrival status.
※Shipping: Flat rate of 480 yen nationwide (free shipping for orders over 8,000 yen including tax)
Estimated Delivery Date for Jewelry:
Orders placed by the end of March 2026: Scheduled for delivery around the end of May 2026
Orders placed by May 10, 2026: Scheduled for delivery around the end of July 2026
※As these are made-to-order items, delivery dates may vary depending on production status.
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Akabane Karma model ring](http://store.karatz.jp/cdn/shop/files/ansatsu2_bnrB_1_1080x1080_f0a5caf5-70b2-4ca3-98ed-875bc439b1bd.jpg?v=1771996033&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Kayano Kaede model ring](http://store.karatz.jp/cdn/shop/files/ansatsu2_bnrB_3_1080x1080_583619a3-3f89-4665-b3bd-1c85e910a491.jpg?v=1771996031&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration Nagisa Shiota model ring](http://store.karatz.jp/cdn/shop/files/ansatsu2_bnrB_2_1080x1080_02146637-f489-4654-a814-1a0d4958e6de.jpg?v=1771996031&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Karasuma Tadaomi model ring](http://store.karatz.jp/cdn/shop/files/ansatsu2_bnrB_4_1080x1080_0cd8a74b-4c0d-44b1-bdee-0854cd074e06.jpg?v=1771996031&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Irina Jelavic model ring](http://store.karatz.jp/cdn/shop/files/ansatsu2_bnrB_5_1080x1080_43830397-3927-489b-8774-fb32721de233.jpg?v=1771996031&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ Collaboration Korosensei Five Great Jewels Figure (Limited to 100 units)](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_1_1080x1080_1be8ed3d-7a10-47a1-9508-85a22ed9b825.jpg?v=1760620266&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Koro-sensei model ring](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_2_1080x1080_5a04ae14-e1e5-4855-aaff-92dce1dc2205.jpg?v=1760620220&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Anime "Assassination Classroom" x KARATZ collaboration Koro-sensei model pendant top](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_3_1080x1080_fc821a2d-a1bd-4f69-bb76-e633fd9eb219.jpg?v=1760620244&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ Collaboration Korosensei Model Necklace](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_4_1080x1080_0741bcdb-ae86-4e38-b0f0-0551548bb990.jpg?v=1760620220&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ Collaboration Korosensei Model Bracelet](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_5_1080x1080_a307a391-2381-4edd-a09a-3a2caaa72c1d.jpg?v=1760620220&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ Collaboration Korosensei Model Earrings (Single)](http://store.karatz.jp/cdn/shop/files/ansatsu_bnrC_6_1080x1080_acf42c5b-8c28-4dd3-9221-8a31ee35ad32.jpg?v=1760620169&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration acrylic stands (6 types)](http://store.karatz.jp/cdn/shop/files/ansatsu_akusuta_7.png?v=1764653453&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] "Assassination Classroom" x KARATZ collaboration stickers (7 designs)](http://store.karatz.jp/cdn/shop/files/ansatsu_sticker_8.png?v=1764653463&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration acrylic keychain (1 type)](http://store.karatz.jp/cdn/shop/files/ansatsu_akukey_1.png?v=1756101686&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration acrylic keychains (5 random designs)](http://store.karatz.jp/cdn/shop/files/ansatsu_akukey_7.png?v=1764653396&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration badges (7 random designs)](http://store.karatz.jp/cdn/shop/files/ansatsu_canbadge_8.png?v=1764653424&width=1080)
![[Sales start at 10 PM on Saturday, March 14th] Assassination Classroom x KARATZ collaboration clear cards (7 random designs)](http://store.karatz.jp/cdn/shop/files/ansatsu_clearcard_8.png?v=1764653490&width=1080)
Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.
So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.
KARATZ's Initiatives and Social Contributions
We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.
KARATZ Books
These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.
jeweler's tools
For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.