blue lid:KOJI

Non-alcoholic, artificial sweeteners, and no sugar used. The glucose, B vitamins, and amino acids produced from the fermentation power of rice koji are gentle and energizing the body.

This is a raw koji drink made with live koji mold, carefully brewed one by one using a non-heating method in the clear water and air of Minamiaiki Village, Nagano Prefecture, at an altitude of 1000m.

We offer a diverse lineup to make it easy to incorporate Japanese fermentation culture into modern life, including amazake-based options that can be customized to your taste, and cozy drinks that can be enjoyed quickly with one hand.

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Why are we doing?

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The reason blue lid:KOJI was born was the slogan 'Let's ferment it.' Japan's fermentation culture has been nurtured alongside people's lives throughout its long history. However, in today's busy daily life, I felt that its richness and warmth were gradually being forgotten. Through koji, we wanted to rediscover Japan's traditional wisdom and aesthetic sensibility, and deliver new value to our lives today.

When launching the brand, the first thing we valued was to be a "cultural bridge." Amazake and koji seasonings are not just health foods or trendy fermented drinks; they connect the past and present, people to people, land and seasons. Our products can create small gaps and insights in someone's life, and from there, new values grow. We aim for such a cycle.

Additionally, blue lid:KOJI's craftsmanship begins with the pure water of Minamiaiki Village, Nagano Prefecture, and carefully selected raw materials. We cherish the blessings of nature and strive to create products that allow you to feel the warmth of handmade craftsmanship and the changing seasons. Fermentation is a process that changes slowly over time. I believe that process itself overlaps with how modern people use "margins" and "mental balance."

blue lid: KOJI is a brand that updates fermentation culture not as a nostalgic past, but as a new value that accompanies modern life, passing it on to the next era. Going forward, we will continue to create products that are gentle and warm, serving as a "bridge of fermentation" connecting nature and people, the past and present.

What are we doing?

At blue lid:KOJI, we offer a variety of products and experiences centered around koji to realize our brand philosophy of 'Let's ferment it.' Our worldview goes beyond being just a food brand, allowing fermentation culture to naturally blend into modern life. Even amid busy days, we strive to design products and services that allow you to pause and feel the "space" to balance your mind and body.

First, in product manufacturing, we use organic rice koji made from pure water from Minamiaiki Village, Nagano Prefecture, and brewery-attached koji mold harvested in-house at a miso brewery in Fukui Prefecture. By using cultures grown in natural environments rather than cultured ones intended for mass production, we achieve a mild, mild, and gentle taste with no strong odors. From selecting raw materials to the manufacturing process, we value the blessings of nature and the temperature of handwork, focusing on maximizing the power of the ingredients without unnecessary additives.

Additionally, we have carefully selected flavors and product lineups so that you can feel the changing four seasons of Japan and the blessings of the land. They offer products that allow you to easily incorporate the benefits of fermentation into modern lifestyles, such as amazake bases, koji seasonings, cozy (an amazake drink you can easily enjoy with one hand), and koji soup base. Every product is designed with ease of use and enjoyment so that you can cherish "time for yourself" amid your busy daily life.

Furthermore, through columns and workshops related to recipes, fermentation, and other activities, we widely share the wisdom of koji and fermentation. From the perspectives of SDGs and sustainability, we aim for sustainable manufacturing by focusing on the use of natural materials, collaboration with local communities, and a lean production system.

Commitment to the product

All blue lid:KOJI products value the gentleness of natural materials and the profound flavors of fermentation. Among them, the flagship is the "Amazake-based" series.

First, the "Amazake Base" uses pure water from Minamiaiki Village, Nagano Prefecture, and organic rice koji grown with brewery koji mold from Fukui Prefecture, resulting in a mellow and neutral flavor. Three flavors to choose from, including the plain type "Sei~Totonoi," the refreshing yuzu-scented "Wa~Naku," and the spicy-scented "Akari~Tomoshibi (Chai)," allowing you to choose from three flavors to suit your mood and health. Limited-time flavors are also available seasonally. You can pour it into a glass and drink it as is, mix it with milk or soy milk, or pour it over yogurt or ice cream—you can customize it freely. Customers have praised it as "essential for daily relaxation" and "easy to drink with its natural sweetness."

Next is the "Cossic" pouch-style amazake drink that can be easily enjoyed with one hand. Just take it out of the freezer, let it sit for a bit, knead it by hand to thaw, and enjoy it straight without a spoon—it's very convenient. By combining it with oat milk, it achieves a smooth richness and gentle mouthfeel without using dairy products. Perfect for busy mornings, snack time, or refreshing after exercise, it is widely supported by generations for being "fun with children" and "easy to incorporate fermentation on the go."

Who are supporting us?

blue lid: KOJI is supported by customers of a wide range of generations. In particular, it has received strong support from women in their 30s~50s who pay attention to their health and diet. People interested in fermentation, organic, and the unique rural lifestyle of enjoying the seasons resonate with this trend, leading to an increase in repeat customers.

Actual purchases are mainly available through the official online store, as well as at the directly managed store "Koji Stand Koshigaya," select shops in Karuizawa, Tokyo, Saitama, and Nagano, hot spring facilities, and cafes. Each store offers proposals tailored to local characteristics and customer needs, as well as catering to gift demands. Gift sets and seasonal products are especially popular as gifts or souvenirs.

We have received many warm comments from customers such as, "The natural sweetness makes it easy to continue every day," "I can enjoy it with my children," and "It gave me time to relax amid busy days." Through social media and blogs, we share wisdom about fermentation and koji, valuing community connections. blue lid:KOJI will continue to support each customer's daily life and spread a gentle and warm fermentation culture.

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