Onsen to Hakko Ofuro Cafe Hakuju no Yu, a day-use hot spring facility in Kamikawa, Kodama District, Saitama Prefecture, operated by Onsen Dojo Co., Ltd. (Tokigawa, Hiki District, Saitama; President Toshiki Yamazaki), will hold an event on Sunday, July 19, 2026, featuring a cutting demonstration and a free kabayaki tasting using domestic eel raised through land-based aquaculture in Kamisato, Saitama.
The eel served at the event is raised at Kamisato halk, a closed-system land-based eel farm. The facility is operated by Hiranuma Suisan Co., Ltd. (Kamisato, Saitama), a company founded in September 2022 with the goal of reviving eel farming within Saitama Prefecture, which began its aquaculture business in Kamisato.
Tawaraya, the restaurant at Hakuju no Yu, regularly serves dishes made with Hiranuma Suisan eel — worth trying alongside the event.
Land-Raised Eel Cutting Demonstration & Free Kabayaki Tasting
- Date: Sunday, July 19, 2026
- Time: Cutting demonstration from 5:00 PM; free kabayaki tasting from 6:00 PM
- Location: Tawaraya restaurant
Collaboration Menu
Aged Brown Rice(R) and Samurai Eel Stone-Grilled Hitsumabushi — ¥2,980
"Samurai Eel," carefully raised at the Hiranuma Suisan land-based aquaculture farm in Kamisato, Saitama, is paired with the fragrant char of stone-grilling and the chewy texture of Aged Brown Rice(R) for an indulgent dish.
About Hiranuma Suisan
Hiranuma Suisan Co., Ltd. is a startup founded in September 2022 around three goals: improving Japan's future food self-sufficiency, passing on food safety knowledge to the next generation, and expanding land-based aquaculture technology overseas. On May 12, 2023, the company signed a comprehensive partnership agreement with the town of Kamisato. On the day of the event, Hiranuma Suisan also plans to accept reservations for its Doyo no Ushi unaju (grilled eel over rice, served in a lacquered box) at a special price.
https://food.hiranumasuisan.co.jp/
About Kamisato halk
The facility's nickname, "Kamisato halk," comes from the initials of its four functions: hydroponics, aquaculture, laboratory, and kitchen. The site spans 4,230 square meters with a total floor area of 1,114 square meters, and its six 50-ton tanks give it the capacity to raise up to 90,000 eels. In May 2025, the farm opened an on-site restaurant, where freshly caught, freshly prepared, and freshly grilled unaju have proven popular.
About Onsen to Hakko Ofuro Cafe Hakuju no Yu
This day-use hot spring facility is known for its highly saline natural spring water, drawn from an ancient rock layer 750 meters underground. Food-focused experiences are also a highlight, including a monthly seafood cutting demonstration and a Nagashi Somen Terrace featuring Saitama Prefecture's first rotating flowing-noodle machine. A relaxing lounge area lets guests unwind after bathing, rounding out an enjoyable and comfortable day-trip hot spring visit.
Address: 337-1 Watase, Kamikawa, Kodama District, Saitama
https://ofurocafe-hakujyu.com/
