Seijo Ishii Proposes New Options for "Everyday Drinks": Launching 3 Types of Teabags "Corn Tea," "Adzuki Bean Tea," and "Black Bean Tea" Made with 100% Hokkaido-Sourced Ingredients!
Seijo Ishii will launch three types of tea bags—"Corn Tea," "Adzuki Bean Tea," and "Black Bean Tea"—made with 100% Hokkaido-sourced corn, adzuki beans, and black beans, respectively, on April 30, 2026. These grain teas offer a new option for daily consumption, available for both cold and hot brewing.
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- 📰 Published: April 28, 2026 at 23:00
- 🔍 Collected: April 28, 2026 at 14:31
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Seijo Ishii Co., Ltd. (Head office: Minato Mirai, Nishi-ku, Yokohama, Kanagawa Prefecture; Representative Director and President: Katsuki Goto) will launch three types of tea bags made with 100% Hokkaido-sourced ingredients: "Seijo Ishii 100% Hokkaido Yubari District Corn Tea," "Seijo Ishii 100% Hokkaido Dainagon Adzuki Bean Tea," and "Seijo Ishii 100% Hokkaido Kurosenkei Black Bean Tea." These products will be available at all 229 Seijo Ishii stores and on the official online shop "Seijo Ishii.com" from Thursday, April 30, 2026.
TOPICS
* Three types of tea bags: "Corn Tea," "Adzuki Bean Tea," and "Black Bean Tea," made with 100% Hokkaido Yubari District corn, Hokkaido Dainagon adzuki beans, and Hokkaido Kurosenkei black beans, will be released nationwide on Thursday, April 30.
* These are exquisite products with less雜味 (unpleasant flavors) and a rich aroma and flavor of grains.
* Usable for both cold and hot brewing, offering a new choice for "everyday drinks" both on the go and at home.
* A present campaign will also be held, where 520 winners will receive a reusable water bottle.
■ Proposing New Options for "Everyday Drinks": Launching 3 Types of Grain Teas Made with 100% Hokkaido-Sourced Ingredients
In recent years, Japan has experienced prolonged summers due to record-high temperatures. In anticipation of this summer, Seijo Ishii's buyers embarked on developing the tea bag category, which sees increasing demand. While barley tea is particularly popular in our company during summer, we also identified a need among consumers who feel "water alone is not satisfying, but drinking only barley tea everyday can become boring." Therefore, we sought to "propose new options for everyday tea bags." We focused on teas made from "grains" such as adzuki beans and black beans, which, like barley tea, are familiar to Japanese people, can be enjoyed regardless of age, time, or situation, and offer a wider variety of flavors. Aiming for a grain tea that reflects Seijo Ishii's commitment to ingredients and manufacturing methods, we developed these products with a domestic manufacturer skilled in sourcing grains and producing tea. Because these are daily consumables, we pursued a balance of "deliciousness, quality, and affordable price," and a quantity and price that can be used without hesitation every day. This time, "Seijo Ishii 100% Hokkaido Yubari District Corn Tea," "Seijo Ishii 100% Hokkaido Dainagon Adzuki Bean Tea," and "Seijo Ishii 100% Hokkaido Kurosenkei Black Bean Tea" will be launched nationwide from Thursday, April 30. They are suitable for both cold and hot brewing*, allowing you to enjoy them on the go or at home, catering to diverse lifestyles.
*Black bean tea is recommended for hot brewing.
■ Commitment to Detail from Ingredients to Tea Bags, Pursuing Rich Grain Flavor and Aroma
In developing these products, we paid meticulous attention to every detail, including ingredient selection, roasting methods, and tea bag materials. For raw materials, we use 100% carefully selected Hokkaido-sourced grains, such as "Vivian variety" corn, known for its sweetness, aroma, and profound flavor; "Dainagon adzuki beans," which account for only about 10% of all adzuki beans harvested in Hokkaido; and "Kurosenkei black beans," characterized by their small size and richコク (umami/richness). To maximize the flavor and aroma of these raw materials, we adopted roasting methods tailored to each grain, primarily using a "hot air roasting" method that envelops the grains in high-temperature hot air. This ensures even heating to the core of the grains without unevenness, resulting in less unpleasant flavors, a clean and elegant aftertaste, and a fragrant aroma. Furthermore, to ensure stable quality of agricultural products, roasting involves visual checks by staff and final confirmation by quantifying the grain color. Additionally, by increasing the content per tea bag to approximately 8g* for corn tea and approximately 5g* for adzuki bean tea and black bean tea, the products achieve a rich grain flavor even when extracted with cold water, avoiding a diluted taste.
Non-woven fabric tea bags ensure thorough extraction, allowing you to enjoy the grain flavor to the very end.
*When calculated by weight per tea bag.
■ Product Information
Seijo Ishii 100% Hokkaido Yubari District Corn Tea (32 bags) - 971 yen - Released on Thursday, April 30
This product offers the gentle sweetness inherent in corn and a deeply fragrant aroma. It uses only "Vivian variety" corn, cultivated in Hokkaido's Yubari District and characterized by its sweetness, aroma, and profound flavor. A unique roasting method brings out the rich aroma of the corn. You can enjoy the gentle sweetness of corn that softly spreads in your mouth.
Seijo Ishii 100% Hokkaido Dainagon Adzuki Bean Tea (32 bags) - 971 yen - Released on Thursday, April 30
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TOPICS
* Three types of tea bags: "Corn Tea," "Adzuki Bean Tea," and "Black Bean Tea," made with 100% Hokkaido Yubari District corn, Hokkaido Dainagon adzuki beans, and Hokkaido Kurosenkei black beans, will be released nationwide on Thursday, April 30.
* These are exquisite products with less雜味 (unpleasant flavors) and a rich aroma and flavor of grains.
* Usable for both cold and hot brewing, offering a new choice for "everyday drinks" both on the go and at home.
* A present campaign will also be held, where 520 winners will receive a reusable water bottle.
■ Proposing New Options for "Everyday Drinks": Launching 3 Types of Grain Teas Made with 100% Hokkaido-Sourced Ingredients
In recent years, Japan has experienced prolonged summers due to record-high temperatures. In anticipation of this summer, Seijo Ishii's buyers embarked on developing the tea bag category, which sees increasing demand. While barley tea is particularly popular in our company during summer, we also identified a need among consumers who feel "water alone is not satisfying, but drinking only barley tea everyday can become boring." Therefore, we sought to "propose new options for everyday tea bags." We focused on teas made from "grains" such as adzuki beans and black beans, which, like barley tea, are familiar to Japanese people, can be enjoyed regardless of age, time, or situation, and offer a wider variety of flavors. Aiming for a grain tea that reflects Seijo Ishii's commitment to ingredients and manufacturing methods, we developed these products with a domestic manufacturer skilled in sourcing grains and producing tea. Because these are daily consumables, we pursued a balance of "deliciousness, quality, and affordable price," and a quantity and price that can be used without hesitation every day. This time, "Seijo Ishii 100% Hokkaido Yubari District Corn Tea," "Seijo Ishii 100% Hokkaido Dainagon Adzuki Bean Tea," and "Seijo Ishii 100% Hokkaido Kurosenkei Black Bean Tea" will be launched nationwide from Thursday, April 30. They are suitable for both cold and hot brewing*, allowing you to enjoy them on the go or at home, catering to diverse lifestyles.
*Black bean tea is recommended for hot brewing.
■ Commitment to Detail from Ingredients to Tea Bags, Pursuing Rich Grain Flavor and Aroma
In developing these products, we paid meticulous attention to every detail, including ingredient selection, roasting methods, and tea bag materials. For raw materials, we use 100% carefully selected Hokkaido-sourced grains, such as "Vivian variety" corn, known for its sweetness, aroma, and profound flavor; "Dainagon adzuki beans," which account for only about 10% of all adzuki beans harvested in Hokkaido; and "Kurosenkei black beans," characterized by their small size and richコク (umami/richness). To maximize the flavor and aroma of these raw materials, we adopted roasting methods tailored to each grain, primarily using a "hot air roasting" method that envelops the grains in high-temperature hot air. This ensures even heating to the core of the grains without unevenness, resulting in less unpleasant flavors, a clean and elegant aftertaste, and a fragrant aroma. Furthermore, to ensure stable quality of agricultural products, roasting involves visual checks by staff and final confirmation by quantifying the grain color. Additionally, by increasing the content per tea bag to approximately 8g* for corn tea and approximately 5g* for adzuki bean tea and black bean tea, the products achieve a rich grain flavor even when extracted with cold water, avoiding a diluted taste.
Non-woven fabric tea bags ensure thorough extraction, allowing you to enjoy the grain flavor to the very end.
*When calculated by weight per tea bag.
■ Product Information
Seijo Ishii 100% Hokkaido Yubari District Corn Tea (32 bags) - 971 yen - Released on Thursday, April 30
This product offers the gentle sweetness inherent in corn and a deeply fragrant aroma. It uses only "Vivian variety" corn, cultivated in Hokkaido's Yubari District and characterized by its sweetness, aroma, and profound flavor. A unique roasting method brings out the rich aroma of the corn. You can enjoy the gentle sweetness of corn that softly spreads in your mouth.
Seijo Ishii 100% Hokkaido Dainagon Adzuki Bean Tea (32 bags) - 971 yen - Released on Thursday, April 30
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