“Shun Aji (Toki Aji) and Summer’s Great Catch Festival” featuring exquisite Nagasaki Prefecture “Shun Aji (Toki Aji)” and Mikawa Isshiki “Large Cut Eel” and more in a midsummer fair! Available from July 7 (Tue) at Nigiri no Tokubei and Kaisen Atom!

K.K. Atom, a company within the Colowide Group (Headquarters: Yokohama, Kanagawa Prefecture; President: Takeshi Ueda), will hold a limited-time “Shun Aji (Toki Aji) and Summer’s Great Catch Festival” at all stores of its conveyor belt sushi chains, “Nigiri no Tokubei” and “Kaisen Atom,” starting July 7, 2026 (Tue).

At all stores of “Nigiri no Tokubei” and “Kaisen Atom,” a limited-time “Shun Aji (Toki Aji) and Summer’s Great Catch Festival” will be held starting July 7, 2026 (Tue).

This fair will feature a total of 23 recommended summer menu items! The highlight this time is “Shun Aji (Toki Aji).” “Shun Aji” refers to horse mackerel weighing over 100g caught in the waters around the Tsushima Strait and Goto Islands between April and August. The horse mackerel raised in the nutrient-rich seas of this region are fatty and delicious, comparable to high-end fish.

We also offer the “Large Cut Grilled Eel,” made with female eel “Enman” from Mikawa Isshiki, boasting approximately 1.5 times the normal size, and the “Seared Nodoguro from Nagasaki Prefecture,” a high-end fish also known as “white fish toro.” Furthermore, new “chilled menus” perfect for hot summer days are here! Don’t miss out on summer-exclusive side dishes like “Clam Cold Soba” and “Chilled Chawanmushi with Yamagata Dashi” with their refreshing texture! Please visit your nearest Nigiri no Tokubei or Kaisen Atom!

Here are some of our recommended menu items!

《Extremely Popular Every Season》 Summer Special Five-Piece Assortment

《Extremely Popular Every Season》 Summer Special Five-Piece Assortment

1,265 yen

This popular five-piece assortment changes its contents with the seasons! Enjoy one piece each of live-caught amberjack, shun aji, boiled octopus, Mikawa Isshiki grilled eel, and whelk with wasabi gunkan, so you won’t get tired of it until the end.

《Plum paste adds a kick》 Shun Aji (Toki Aji) Namero Miso with Plum

《Plum paste adds a kick》 Shun Aji (Toki Aji) Namero Miso with Plum

451 yen

This is a popular topping known as the finest among the horse mackerel family.

It has a firm texture and the richness of elegant fat. As you chew, a gentle sweetness spreads, filling your mouth with a pleasant aftertaste.

《Mikawa Isshiki Female Eel》 Large Cut Grilled Eel, One Piece

《Mikawa Isshiki Female Eel》 Large Cut Grilled Eel, One Piece

539 yen

Mikawa Isshiki female eel “Enman” is softer and has a fluffier texture and richer flavor compared to male eel. It’s a generous large cut, about 1.5 times the usual size. Enjoy with sansho pepper if you like.

《White Fish Toro》 Seared Nodoguro, One Piece

《White Fish Toro》 Seared Nodoguro, One Piece

649 yen

Carefully selected from Nagasaki Prefecture! This high-end fish is also called “white fish toro.” By thoroughly searing the skin, the aroma and melting fat further enhance its umami.

《Impressive Visual》 Double Portion Hand-Rolled Eel Butter

《Impressive Visual》 Double Portion Hand-Rolled Eel Butter

539 yen

Two slices of summer stamina-boosting “eel” are layered and generously mixed with butter for an impressive visual! A dish that stimulates the appetite with the exquisite blend of sweet reduction sauce and salty butter.

《Dashi-Flavored Dish》 Soba Inari

《Dashi-Flavored Dish》 Soba Inari

407 yen

Fried tofu pouches seasoned with a light sweetness, wrapped around matcha soba, mitsuba, and chopped myoga ginger. A great dish to enjoy after drinks.

《Rich Combination》 Hime Don (Mini Bowl) – Uni Avocado

《Rich Combination》 Hime Don (Mini Bowl) – Uni Avocado

649 yen

“Hime Don” is a small, two-bite bowl. This dish features the creamy richness of sea urchin and avocado, enhanced by the aroma of grilled nori.

*All prices include tax. *Photos are for illustrative purposes only.

Shun Aji (Toki Aji) and Summer’s Great Catch Festival Overview

Sales Period

July 7, 2026 (Tue) – August 24, 2026 (Mon)

Sales Stores

Conveyor belt sushi chains: Nigiri no Tokubei (43 stores), Kaisen Atom (9 stores) – Total 52 stores

*Menu items may vary by store. *Content is subject to change or cancellation without notice.

Products

【Sushi】

・Shun Aji (Toki Aji) 407 yen

・Shun Aji Namero Miso with Plum 451 yen

・Large Cut Grilled Eel, One Piece 539 yen

・Large Cut Grilled White Eel, One Piece 539 yen

・Seared Nodoguro, One Piece 649 yen

・Chiba-Caught Kinmedai 869 yen

・Hime Don – Uni Avocado 649 yen

・Soba Inari 407 yen

・Double Portion Hand-Rolled Eel Butter 539 yen

・Aged Hirame 451 yen

・Salt-Cured Red Flatfish 451 yen

・Live-Caught Amberjack 539 yen

・Boiled Octopus 341 yen

・Grilled Eel Liver Gunkan 308 yen

・Whelk with Wasabi Gunkan 198 yen

・Summer Tasting Trio 715 yen

(Live-Caught Amberjack, Salt-Cured Red Flatfish, Aged Hirame)

・Summer Special Five-Piece Assortment 1,265 yen

(Live-Caught Amberjack, Shun Aji, Boiled Octopus, Mikawa Isshiki Grilled Eel, Whelk with Wasabi Gunkan)

【Side Menu】

・Chilled Chawanmushi with Yamagata Dashi 363 yen

・Shun Aji (Toki Aji) Cold Soup with Horse Mackerel 451 yen

・Clam Cold Soba 539 yen

・Potelico Salad 429 yen

・Deep-Fried Red Shrimp 407 yen

・Umaki (with Tororo) 649 yen

*All prices above include tax. *Photos are for illustrative purposes only.

Not just sushi!! Plenty of refreshing side menus for summer!

To coincide with the fair, we have also prepared recommended side menus for this season. Please enjoy them along with our sushi!

《Delicious Enough to Drink the Broth》 Clam Cold Soba

《Delicious Enough to Drink the Broth》 Clam Cold Soba

539 yen

Hokkaido-sourced cold soba noodles topped with plenty of clams and mitsuba. The broth is full of clam flavor and is so delicious you’ll want to drink it all! Enjoy it refreshingly even on hot days.

《Cool and Smooth!》 Chilled Chawanmushi with Yamagata Dashi

《Cool and Smooth!》 Chilled Chawanmushi with Yamagata Dashi

363 yen

A chilled chawanmushi mixed with Yamagata specialty “dashi.” Enjoy its refreshing flavor from aromatic vegetables and its cool texture.

《Miyazaki Regional Dish》 Shun Aji (Toki Aji) Cold Soup with Horse Mackerel

《Miyazaki Regional Dish》 Shun Aji (Toki Aji) Cold Soup with Horse Mackerel

451 yen

Luxuriously uses Shun Aji (Toki Aji). With the crunchy texture of cucumber and plenty of aromatic vegetables, this cold soup is refreshing and easy to eat even on hot days.

《Fluffy Texture!》

《Fluffy Texture!》

429 yen

A hot snack born from “Jagarico.” Enjoy the freshly fried, fluffy texture that both adults and children can enjoy as a family.

*All prices above include tax. *Photos are for illustrative purposes only.

Seasonal Lunch using Summer-Limited Toppings Also Available from July 7 (Tue)!

Lunch menus, available weekdays until 5 PM (and Saturdays until 4 PM at some stores), allow you to enjoy fresh, seasonal toppings at a great value! Starting July 7, 2026 (Tue), we will also offer “Seasonal Nigiri” using summer-limited toppings. Furthermore, during lunchtime, we offer a daily miso soup that you can enjoy for free, as many bowls as you like, hot from the self-service counter. Our lunch menu, offering authentic sushi made by skilled chefs at affordable prices, is highly recommended for those visiting Nigiri no Tokubei or Kaisen Atom for the first time.

【Summer Limited Lunch Menu】 Seasonal Tokubei Nigiri

【Summer Limited Lunch Menu】 Seasonal Tokubei Nigiri

1,738 yen

Tuna, squid, Hime Don Unakyu, salt-cured red flatfish, boiled octopus, red shrimp, live-caught amberjack, whelk with wasabi gunkan, chawanmushi

*Not available at some stores. *All prices include tax.

*Photos are for illustrative purposes only. *The lunch menu above is from Nigiri no Tokubei’s menu. Kaisen Atom’s menu differs.

About Nigiri no Tokubei and Kaisen Atom

<Nigiri no Tokubei>

Nigiri no Tokubei, with a total of 43 stores mainly in the Tokai region, is a conveyor belt sushi restaurant where you can enjoy “energy,” “seasonality,” and “tradition.” We offer authentic sushi made with time-honored techniques, using ingredients that emphasize freshness and origin, served with cheerful energy and bright smiles. We welcome our customers with a focus on “Honmaguro” (premium bluefin tuna), “seasonal fresh fish,” and “traditional techniques.”

・HP https://www.nigirinotokubei.com/

・X https://twitter.com/tokubei1971

・Instagram https://www.instagram.com/tokubei1971/

<Kaisen Atom> Kaisen Atom has 9 stores in Fukui Prefecture, offering conveyor belt sushi where you can fully enjoy local ingredients. In addition to classics like Honmaguro, popular items include seasonal dishes, Fukui’s regional specialty “grilled mackerel,” “red snow crab” with its delicate, soft texture and gentle sweetness, and the “Buri Tekka Maki” rolled with fresh yellowtail and perilla leaves, showcasing Fukui’s unique flavors. We also offer dry Fukui-born sake that pairs well with sushi.

・HP https://www.kaisenatom.com/

・X https://twitter.com/kaisenatom

・Instagram https://www.instagram.com/kaisenatom/

Introducing the Atom App

The integrated app combining “Steak Miyamoto,” “Karubi Sho,” “Ganko Tei,” “Nigiri no Tokubei,” “Kaisen Atom,” and “Katsutoki.” It’s called the Atom App!

With a single app, you can manage information for each brand, receive coupon distributions, and more. It also includes the “Atom In-Store Common Point Card.”

Atom Common In-Store Points are awarded as 10 points after payment by scanning a QR code in the store. Accumulate 50 points to exchange them for a “500 yen coupon” usable at any brand. For details on point accrual conditions, please check the app. You can use it more conveniently and affordably, so please install it now.

Install here