Fermented Umami Eat, Dashi Soy Sauce Image Fermented Umami Eat, Plum Dashi Soy Sauce Image

Kusefuku Store, operated by Sanq Zeal Co., Ltd. (Headquarters: Iizuna Town, Nagano Prefecture), will begin sequentially releasing its revamped popular products—'Eat, Dashi Soy Sauce' and 'Eat, Plum Dashi Soy Sauce'—as 'Fermented Umami Eat, Dashi Soy Sauce' and 'Fermented Umami Eat, Plum Dashi Soy Sauce' starting July 15, 2026, at stores nationwide and on its official online shop.

This revamp responds to customer feedback requesting a milder salt taste, aiming to deliver a more pronounced fermented umami flavor while reducing salt content. By enhancing the natural sweetness and umami from rice koji, the product has evolved into a smoother, more enjoyable taste that invites repeated consumption.

A Popular Product Rooted in Shinshu’s Local Cuisine

The 'Eat, Dashi Soy Sauce' series originated from combining Shinshu’s traditional 'shoyu beans' with the rich umami of katsuobushi (bonito flakes) from Yaizu. Enjoyed not only as a rice accompaniment but also with chilled tofu, ochazuke, and vegetable dips, it has become a long-selling favorite at Kusefuku Store.

Key Improvements in the Revamp

① Reduced salt content for a more palatable taste

While preserving deliciousness, the salt content has been carefully reviewed and reduced.

② Increased rice koji to enhance fermented umami

Simply reducing salt can diminish flavor. Therefore, the focus was placed on rice koji, the source of fermented umami.

Product Name

Salt Reduction Rate

Rice Koji Quantity

Fermented Umami Eat, Dashi Soy Sauce

Approx. 23% reduction

Approx. 30% increase

Fermented Umami Eat, Plum Dashi Soy Sauce

Approx. 44% reduction

Approx. 50% increase

*Compared within the company

Image of the Soy Sauce Brewery

Buyer’s Comment

Buyer Toda

Thanks to the meticulous fermentation process by Marui Shoyu Co., Ltd.—a manufacturer that values traditional wooden barrel brewing—the 'Eat, Dashi Soy Sauce' series has become even more delicious.

Domestic soybeans and rice koji are slowly aged at low temperatures for about two months in raw soy sauce marinade, with additional koji added to deepen umami. Generous layers of hand-smoked katsuobushi from Yaizu are then added, creating a harmonious blend of fermented umami and rich dashi flavor. The ability to savor each grain of moromi as a 'topping' offers a depth of flavor rarely achievable at home—this is the product’s greatest appeal.

Additionally, the label design has been refreshed. Featuring a motif inspired by wooden barrels and soy sauce breweries, the new design expresses the brand’s dedication to traditional fermentation culture and craftsmanship.

Product Information

Product Name: Fermented Umami Eat, Dashi Soy Sauce

Net Weight: 120g

Shelf Life: 360 days

Price: 640 yen (tax included)

Release Date: Wednesday, July 15, 2026

Sales Locations: Kusefuku Store nationwide / Official Online Shop

Product Details Here

Product Name: Fermented Umami Eat, Plum Dashi Soy Sauce

Net Weight: 120g

Shelf Life: 360 days

Price: 670 yen (tax included)

Release Date: Wednesday, July 15, 2026

Sales Locations: Kusefuku Store nationwide / Official Online Shop

Product Details Here

An interview with producers from Nakano City, Nagano Prefecture, who craft the 'Fermented Umami Eat, Dashi Soy Sauce,' is now available. We explored their passion and the history behind the product.

── Did President Tamiya personally engage in soy sauce brewery work since childhood?

Looking back, every day felt like 'on-the-job training in business.' I helped repair roofs and assisted with deliveries alongside employees. I also closely observed the crucial 'koji-making' process.

But I didn’t have a strong sense of 'inheriting the family business' back then, …

Read the full interview

Kusefuku Store

Kusefuku Store is a Japanese gourmet select shop brand offering dashi, seasonings, rice accompaniments, and sweets. Kusefuku buyers travel across Japan to discover proud artisans and delicious products. We add unique value to each item, offering one-of-a-kind gourmet experiences. We serve as a bridge between makers and customers, delivering 'deliciousness' to your dining table.

Website & SNS

Official Website URL https://www.stcousair.co.jp/company ■ Official Online Shop https://kuzefuku.com ■ Rakuten Market Store https://www.rakuten.co.jp/sc-rkt/

Official SNS X (Kusefuku Store): https://x.com/kuzefuku X (Sanq Zeal): https://x.com/stcousair

Instagram (Kusefuku Store): https://www.instagram.com/kuzefuku/ Instagram (Sanq Zeal): https://www.instagram.com/st.cousair/

Facebook (Kusefuku Store): https://www.facebook.com/kuzefuku/ Facebook (Sanq Zeal): https://www.facebook.com/stcousaircoltd/

note (Sanq Zeal no Mori): https://note.com/stcousair_forest

FACT BOX

  • Source: PR TIMES
  • Category: New Product