IBUKI

IBUKI is the bottled-tea brand of Kanesu Seicha, a tea company in Shimada City, Shizuoka Prefecture. Kanesu Seicha began as a tea brokerage firm that mediated transactions between producers and tea merchants. It was founded when the father-in-law of Yukiya Komatsu, a former employee of the local agricultural cooperative, went into business for himself as a tea broker. Its original name was Suzuki Kenji Shoten. Its trade name superimposes a carpenter's L-square on the katakana character 'su', a symbol of straightness. In a September 2023 interview, the company's history was put at more than 60 years.^[1],[2]

Yukiya Komatsu created "Bottled Tea IBUKI", the prototype of IBUKI bottled tea. Kanesu Seicha began selling its bottled tea brand 'Ibuki' in 2016, at a time when there were almost no other companies in the bottled tea market. Genki Komatsu, the fourth generation of Kanesu Seicha, founded and launched the "IBUKI bottled tea" brand in November 2022.^[1]

IBUKI has a factory-owned store at 834-1 Ushio, Shimada-shi, Shizuoka 428-0006.^[3]

Yukiya Komatsu. Yukiya Komatsu was born in Yamanashi Prefecture and worked as a salaryman in Tokyo. At 27 he took over his wife's family's tea wholesaler in Shizuoka, entering the tea industry with no prior knowledge. He spent his first year studying at the National Tea Research Institute in Makinohara. A September 2023 interview described him as the third-generation head of Kanesu Seicha and its President and CEO. IBUKI's website states that he supervises the blending and processing of the company's teas using its own recipes.^[1],[2]

Yukiya Komatsu holds the titles of Japanese Tea Appraiser, Hand-Rolled Tea Master and Japanese Tea Instructor. A September 2023 interview counted 39 holders of the appraiser title in Japan. In its 10 October 2023 announcement of a CHAGOCORO interview, IBUKI described him as chair of the Japan Tea Appraisers Association.^[1],[4],[5]

Genki Komatsu. Genki Komatsu, Yukiya Komatsu's son, was born in 1994 in Shimada City as the eldest son of the Kanesu Seicha family. He aimed to become a teacher and enrolled in the Faculty of Education at Waseda University. After graduating he worked at venture and startup companies in Tokyo, in venture staffing and food tech, gaining experience in business launches and operational efficiency. He also worked for about a year at TeaRoom, a Tokyo company engaged in Japanese tea businesses, before returning to the family business.

Genki Komatsu is the branding manager of IBUKI bottled tea and the fourth-generation successor of Kanesu Seicha. He led the brand's branding, establishing its concept, mission and values, redesigning the website, and creating the packaging design and guidelines. An interview described him as the brand owner of IBUKI bottled tea.

Tea team. According to IBUKI, its tea team's skills include those of a sixth-dan tea appraiser and a hand-tea-rubbing instructor.^[6],[7]

IBUKI judges its tea by the standards of Japanese tea inspection. It pursues a sencha whose liquor is golden (kinshoku) rather than green, a hue that has traditionally signified high-quality sencha. It frames this through 'suishoku' (water colour), a traditional quality criterion based on the hue of the liquid extracted from the leaves. IBUKI defines authentic Japanese tea as having an impressive umami and a golden, light liquid colour, "as if grown in misty mountainous regions".^[8],[9]

The brand applies professional tea-quality inspection expertise, of the kind used in Japanese tea inspection, to bottled tea. Its parent, Kanesu Seicha, has long sold mainly to specialty tea shops, crafting tailored teas to each shop's flavour requests in order to build long-term trust.^[1]

Sencha. The sencha bottlings are distinguished by style names on the producer's website.

• IBUKI -- 'Umami Sencha', described as the flagship intended to change the 'concept of Japanese tea'; 750ml and 180ml
• KOUSHUN -- 'Aromatic Sencha', a fragrant sencha marketed for a celebratory toast
• IKUMI -- 'Crisp Sencha', subtitled 'Kire no Sencha'; 730ml

Black tea, oolong and limited bottlings. Beyond sencha, the range includes Japanese black teas and an oolong, plus limited releases.

• NIROKU -- Japanese-style black tea (wakocha)
• KANKO -- Earl Grey Japanese black tea, 730ml
• SEISOU -- Japanese-produced oolong, released as a summer-limited product
• UTSUROI -- developed jointly with ANoTHER IMPERIAL HOTEL, released in November 2024
• IBUKI FIRST flush -- limited editions made from new-season tea, documented for 2024, 2025 and 2026

IBUKI's bottled teas are made from water and tea leaves only, without additives. Blended Shizuoka tea leaves are extracted with ultra-soft water drawn from the Oi River. IBUKI states that it uses only the highest-quality Shizuoka green and black teas. In a July 2025 post, it stated that all sencha it uses is first-flush tea picked that year and used in its best condition.^[10]

Filtered Cold Brew. IBUKI developed what it calls the "Filtered Cold Brew" method over many years, and credits it with the creation of IBUKI bottled tea. The method extracts without heat and sterilizes without heat, with temperature controlled at the 0.1°C level. The tea is extracted through a filter fine enough to block even small bacteria, which IBUKI says preserves the liquor's shining colour and transparency. IBUKI describes the result as keeping the tea's original, unheated flavour, which it likens to 'raw tea'.^{[2],[8],[11],[12],[13],[14]}

• IBUKI -- extracted without heat through a micro-level three-layer filter (March 2024 interview)
• KOUSHUN -- no heat treatment
• NIROKU -- extraction designed to maximize sweetness and aroma
• IKUMI -- a special extraction method to draw out the umami, sweetness and richness of Yabukita

Super-soft Oi River water. IBUKI's water is drawn from the Oi River, a Southern Alps river that IBUKI describes as naturally filtered through fertile geological strata. It is further softened at the factory into what IBUKI calls 'super soft water'.^[2]

Blending and fire-roasting. For IKUMI, IBUKI blends and fire-roasts Yabukita leaves in-house to bring out the variety's characteristic flavour. In a May 2025 post, IBUKI said UTSUROI's original blend was developed through repeated trial production.

First-flush bottling. The IBUKI FIRST flush editions use the year's new tea (shincha). The 2024 edition used the 2024 first flush of Kanaya Ibuki. The 2025 edition used tea first harvested on 24 April 2025 and was bottled within one week of being picked and manufactured.

IBUKI's website states that the Kanaya Ibuki cultivar was created to restore Shizuoka's authority as a tea-producing region. It says the cultivar was developed through years of research with local producers to offer the season's flavour earlier than any other region.^[6]

Regional setting. Shimada City's Kawane district, in the mountainous middle reaches of the Oi River, has long produced 'Kawane tea', a premium tea on par with Uji and Sayama teas. The nearby Makinohara Plateau is home to the Makinohara Tea Plantation, Japan's largest tea plantation. The Ikumi area of Shimada City, which gives IKUMI its name, is one of the legacy areas where sencha has been handed down.^[1]

Production standards. IBUKI produces all of its bottled teas in its own dedicated factory, which it describes as built to world-standard specifications. It states that the factory is FSSC 22000-certified and that certification was obtained in 2023. In May 2023, IBUKI said each bottle is produced one by one. It also said each bottle carries a serial number tied with a ribbon as proof of individual finishing. Products are made to order. IBUKI's website gives the time from order to shipment both as 2–4 and as 5–6 business days.^[15]

Across the range, IBUKI's descriptions centre on umami, sweetness and aroma.^{[2],[4],[6],[12],[16],[17],[18],[19],[20]}

• IBUKI -- mellow sweetness, rich umami, a clear golden liquor, floral aroma and a long aftertaste; IBUKI says a small amount shows its full potential
• KOUSHUN -- fruity, vibrant aroma, a scent reminiscent of high-quality nori, refreshing umami and mild bitterness, with a bluish-yellow hue
• IKUMI -- described as a higher-grade sencha with a balanced taste, distinct from tea brewed in a kyusu
• NIROKU -- vibrant top-note aroma, sweetness lingering on the tongue and a soft yet full body; IBUKI says it has little of the tartness of high-temperature black tea; a July 2023 post noted a mellow honey-like fragrance
• KANKO -- refreshing, effervescent citrus aroma, fruity sweetness and a lingering umami finish
• SEISOU -- fruity, muscat-like aroma with subtle sweetness, clean umami and refreshing astringency
• UTSUROI -- described by Genki Komatsu as fruity in aroma with a body-rich finish; a January 2025 post by ANoTHER IMPERIAL HOTEL described aroma and flavour that slowly change with temperature and air

Temperature. IBUKI recommends serving its bottled tea cold, warming it slightly in the hand to release aroma, and attending to the lingering aftertaste.^[2]

Pairing. The producer's website suggests specific food matches for several bottlings.

• KOUSHUN -- main dishes and salty dishes such as cheese
• NIROKU -- Japanese and Western sweets
• SEISOU -- meat dishes and smoked foods, and Chinese, Italian and Japanese cuisine

Storage & Shelf Life. All IBUKI bottled teas are shipped by refrigerated delivery and must be kept refrigerated. They should be consumed as soon as possible after opening.^[21]

• IBUKI: within 1 month
• KOUSHUN, NIROKU: within 3 months
• IKUMI, SEISOU: within 6 months

Imperial Hotel. IBUKI and ANoTHER IMPERIAL HOTEL jointly developed UTSUROI, released in November 2024. Imperial Hotel bartenders Ido and Watanabe worked with Genki Komatsu on its development, evaluating the aroma and flavour of the tea leaves. An Imperial Hotel bartender visited tea fields and manufacturing facilities in Shizuoka Prefecture to finalize the blend. An April 2026 post stated that IBUKI was chosen as Imperial Hotel's tea partner for ANoTHER IMPERIAL HOTEL on four criteria: rarity, design, story and spirit of support.^[22]

Ine to Agave. IBUKI collaborated with the sake brewery Ine to Agave on the craft sake 'Ine to Wakoucha'.^[23]

EnCounter. For a Japanese tea cocktail experience at EnCounter on 19 July 2026, Shizuoka-based bartender Shoichi Murata devised three bottled-tea cocktails.^[24]

Gen's Kitchen. IBUKI partnered with the YouTube channel 'Gen's Kitchen' (SUIJIBA), which focuses on mindful living and cooking.^[25]

Kanesu Seicha's teas have won awards at tea competitions, including the Minister of Agriculture, Forestry and Fisheries Award and the Grand Gold Award at the World Green Tea Contest. KOUSHUN won a Gold Award at the 2019 World Green Tea Contest. IBUKI's website states that IBUKI was developed in an environment that has won the Minister of Agriculture, Forestry and Fisheries Award and the Governor of Tokyo Award.^[1]