"Shima-aji and Early Summer Delicacies Festival" - Top-tier "Shima-aji," raw-edible "Ogon Anago," and more early summer delights! Available from Tuesday, May 12th at Nigiri no Tokubei and Kaisen Atom!

Atom Co., Ltd. (Headquarters: Yokohama City, Kanagawa Prefecture; Representative Director and President: Takeshi Ueda) of the Colowide Group will hold the "Shima-aji and Early Summer Delicacies Festival" for a limited time starting Tuesday, May 12, 2026, at all "Nigiri no Tokubei" and "Kaisen Atom" conveyor belt sushi restaurants.

At all "Nigiri no Tokubei" and "Kaisen Atom" stores, the "Shima-aji and Early Summer Delicacies Festival" will be held for a limited time starting Tuesday, May 12, 2026.

This fair will feature a total of 20 recommended summer menu items! This time's highlight is "Shima-aji." "Shima-aji" is a popular ingredient known as the highest quality among horse mackerel species. It boasts a firm texture and an elegant richness of fat. With each bite, a gentle sweetness spreads, filling your mouth with a pleasant aftertaste.

We also offer rare conger eel that can be eaten raw, "Ogon Anago," and "Chiba Tsurikinme," a special splendid alfonsino certified as a Pride Fish, recommended by local fishermen with confidence.

Furthermore, don't miss the limited-time early summer side dishes, such as "Shiroyaki Anago Chazuke" (grilled conger eel over rice in tea broth) fragrant with black seaweed and sansho pepper, and "Karasumi Soba" (buckwheat noodles with cured mullet roe) luxuriously using domestic karasumi, one of Japan's three great delicacies!

Please visit your nearest Nigiri no Tokubei or Kaisen Atom!

Here are some of our top recommended menu items!

《Always popular every season》Early Summer Special Five-Piece Assortment

1,430 yen

This popular five-piece assortment changes its contents every season! You can enjoy one piece each of live-closed Shima-aji, Chiba Tsurikinme, live kuruma prawn, squid, and Suzuki Konbu-jime, so you won't get tired of it until the very end.

《The pinnacle of horse mackerel》Live-closed Shima-aji

649 yen

This is a popular ingredient known as the highest quality among horse mackerel species.

It boasts a firm texture and an elegant richness of fat. With each bite, a gentle sweetness spreads, filling your mouth with a pleasant aftertaste.

《From Boso Peninsula (Sotobo)》Chiba Tsurikinme

869 yen

Pride Fish are truly delicious fish selected by fishermen. "Chiba Tsurikinme" is a special splendid alfonsino certified as a Pride Fish, with exceptional fat content. Please enjoy it with ponzu sauce and shichimi chili pepper.

《Can be eaten raw》Ogon Anago (Golden Conger Eel) One Piece

715 yen

This is a rare raw conger eel characterized by its freshness and lack of odor, allowing it to be eaten raw, as it is immediately live-closed after being landed in Tsushima, Nagasaki Prefecture. Served with crispy bone crackers for a delightful texture.

《Exceptional fat content》Live-closed Isaki (Chicken Grunt) Seared One Piece

407 yen

Those caught in season are also called "Tsuyu Isaki" (rainy season Isaki) and are said to be even more delicious with increased fat content. The skin is seared for a fragrant aroma.

《Magnificent fluffy and crispy》Anago Ippon Ten (Whole Conger Eel Tempura)

649 yen

A whole plump conger eel, delicately finished with a light batter.

《Fragrant with seaweed and sansho pepper》Shiroyaki Anago Chazuke (Grilled Conger Eel over Rice in Tea Broth)

539 yen

An elegant chazuke with fragrant grilled conger eel, black seaweed, and sansho pepper.

《Refreshing with aromatic vegetables》Ma-iwashi (Sardine) Early Summer Style

341 yen

Underneath the sardine, aromatic vegetables and grated ginger are hidden for a refreshing taste.

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

Shima-aji and Early Summer Delicacies Festival Overview

■Sales Period

May 12, 2026 (Tuesday) - June 29, 2026 (Monday)

■Participating Stores

Conveyor belt sushi chains: 43 Nigiri no Tokubei stores, 9 Kaisen Atom stores, total 52 stores.

*Menu contents may vary at some stores. *Contents may be subject to sudden changes or cancellation.

■Products

【Sushi】

・Live-closed Shima-aji 649 yen

・Chiba Tsurikinme 869 yen

・Live-closed Isaki Seared One Piece 407 yen

・Early Summer Tasting Assortment (3 pieces) 704 yen

(Live-closed Shima-aji, Suzuki Konbu-jime, Squid)

・Kin-toro Anago Shiroyaki (Golden Fatty Conger Eel Grilled) 451 yen

・Anago Tasting Assortment (3 pieces) 1,155 yen

(Kin-toro Anago Shiroyaki, Live-closed Boiled Anago, Ogon Anago)

・Hime-don Anakyū (Mini Bowl with Conger Eel and Cucumber) 407 yen

・《From Tsushima, Nagasaki Prefecture》Ogon Anago (Golden Conger Eel) One Piece 715 yen

・《From Chiba Prefecture》Ma-iwashi (Sardine) Early Summer Style 341 yen

・《From Hokkaido》Shako (Mantis Shrimp) One Piece 539 yen

・《Natural》Live Kuruma Prawn One Piece 341 yen

・《From Ishinomaki》Suzuki Konbu-jime (Sea Bass Cured with Kelp) 451 yen

・Ika Mekabu Gunkan (Squid and Mekabu Seaweed Battleship Roll) 198 yen

・Early Summer Special Five-Piece Assortment 1,430 yen

(Live-closed Shima-aji, Chiba Tsurikinme, Live Kuruma Prawn, Squid, Suzuki Konbu-jime)

【Side Dishes】

・Shiroyaki Anago Chazuke (Grilled Conger Eel over Rice in Tea Broth) 539 yen

・Anago Ippon Ten (Whole Conger Eel Tempura) 649 yen

・Karasumi Soba (Buckwheat Noodles with Cured Mullet Roe) 572 yen

・Anago-iri Dashimaki Tamago (Rolled Omelet with Conger Eel) 616 yen

・Aji Fry (Fried Horse Mackerel) 407 yen

・Corn Fragrant Fried 407 yen

*All prices include tax.