Ryuoh Radon Onsen" Ranked No. 1 in the Nation Celebrates 80th Anniversary Commemorative coupon tickets on sale and special lactobacillus sales Start of present campaign for 80 winners

Yutopia Corporation (Location: Kai City, Yamanashi Prefecture; Representative Director: Yoshiteru Hayakawa), operator of Ryuoh Radon Onsen Yutopia, celebrates its 80th anniversary on February 23, 2026.

To commemorate this event, the 80th anniversary commemorative bathing coupon tickets (6 coupons), which have been requested by many customers, will go on sale today at a special price of 4,290 yen (tax included; regular price 5,280 yen). At the same time, a 30% discount on the lactobacillus supplement "11-1 (Ichi-ichi no Ichi-)" will be offered, and the same number of tickets will be given away as gifts.

80th Anniversary Greeting

Special coupon tickets on sale

Three commemorative projects to mark the 80th anniversary of the company's founding

In the 80 years since its establishment in 1946, Yutopia Co., Ltd. has been in the construction materials business and then in the hot spring business, drilling for hot springs in 1975 and commencing hot spring operations in 1977. As a result, the quality of the springs has been recognized nationwide, winning first place in the "health promotion" category of the Onsen General Election for three consecutive years (2019-2021) and first place in the "good hot water" category of the NIFTY Onsen Ranking for two consecutive years (2023-2024).

In recent years, as people have become more health-conscious, more users have sought out the intrinsic value of hot springs, and as of February 2026, the aging of Japan's population has further increased interest in preventive medicine and health maintenance, and "hot spring cures" utilizing hot springs are once again attracting attention. In particular, as expectations for scientifically based hot spring therapy are rising, the facility, as one of the largest radon hot springs in Japan, offers an "inhalation hot spring" where radon can be taken in not only through bathing but also through breathing, and is supported by many people seeking to improve their health.

To mark the 80th anniversary of the facility, the company will simultaneously launch three projects to show its appreciation: "commemorative bathing coupons," "special sales of lactobacillus supplements," and "lottery gift campaign," which have been particularly requested by customers.

Details of the 80th anniversary project: Three special offers for a great value experience

Project 1] Limited 80th Anniversary Commemorative Bathing Coupon Tickets on Sale

Commemorative coupon tickets, the most requested by customers, will go on sale today, February 23, at a special price of 4,290 yen (19% discount, including tax) for a 6-pack of coupon tickets, compared to the regular price of 5,280 yen. This is a limited offer and will end while supplies last. The coupons can be used for one-day bathing until the end of December 2026.

6-pack coupon tickets

The regular price for one-day bathing at this facility is 880 yen for adults, but with these coupon tickets, the price is 715 yen per use, a savings of 165 yen per use. The high quality of the hot spring baths, which have been ranked No. 1 in Japan in the Onsen General Election and Nifty Onsen Ranking, is attracting a lot of interest, especially among repeat visitors, as an opportunity to experience hot springs at a more reasonable price.

Project 2] Special sales of lactic acid bacteria "11-1 (Ichi-ichi-noichi)

Lactobacillus supplement "11-1", jointly developed by the University of Tokyo Faculty of Pharmaceutical Sciences and Antenna Corporation, will be on sale at a 30% discount to commemorate the 80th anniversary. In addition, visitors will receive a gift equal to the number of items they purchased. In other words, this is a very economical plan with a 65% discount in effect.

Lactobacillus "11-1" Ichi-ichi

The specific prices are as follows

1 unit: Normally 9,790 yen (including tax) → 6,853 yen + 1 more unit as a gift for visitors

3 pieces: Usually 27,500 yen (including tax) → 19,250 yen + 3 more pieces as a gift for visitors

6 pieces: Usually 52,800 yen (including tax)→36,960 yen + 6 more pieces for visitors

12 pieces: Regularly 99,000 yen (including tax) → 69,300 yen + 12 more pieces for visitors

11-1" is a lactic acid bacteria supplement developed to further enhance the effects of hot spring bathing, and supports health building from the inside out. By using it in combination with hot spring bathing, synergistic effects of "health, beauty, and rejuvenation" can be expected.

Project 3】Line registration limited to 80 people present campaign

80 people who register as friends on the company's official LINE will be selected by drawing to receive either a special 6-pack of coupon tickets or a copy of "Let's Create the Best Hot Spring in Japan (book)".

The application procedure is simple.

Official personal line: https://lin.ee/hvehM32

Official corporate line: https://lin.ee/8b8E4XP

Once you have registered as a friend on either of the above, an application form link will appear on the screen. The results of the lottery will be announced when the products are shipped.

Let's build the best hot spring in Japan!

The book "Let's Create the Best Hot Springs in Japan" is a book by Yoshiteru Hayakawa, the president of the company, describing his passion for the hot spring business and his commitment to the quality of hot springs, and has become a hot topic among hot spring fans.

Multiple times ranked No. 1 in the nation, highly regarded "triple effect

The greatest feature of Ryuoh Radon Onsen is the "Triple Effect," which is a combination of the following three elements.

Overall view of the building

1. One of the largest radon hot springs in Japan (alpha radiation therapy)

We use one of the largest radon generators in Japan to produce hot springs containing high concentrations of radon. Radon is a naturally occurring noble gas that has long been the focus of attention in the field of hot spring therapy. The facility is highly supported by long-term residents for the purpose of spa therapy as a "hot spring to inhale" where radon can be experienced through both bathing and breathing.

2. "Hot springs with good hot water" using highly concentrated reduced hydrogen water

By using highly reductive hydrogen water in the hot spring water, we are pursuing a good feeling on the skin. This approach has been highly evaluated, and the spa was ranked No. 1 in Japan in the "good hot water" category of the Nifty Hot Springs Ranking for two consecutive years in 2023 and 2024.

3. Beauty Onsen POLA-certified "Melting Purifying Onsen

The hot spring is gentle to the skin and is highly supported, especially by female users who are highly interested in beauty. The ingredients contained in the hot spring gently remove dead skin cells from the skin, resulting in a skin beautifying effect.

Thanks to these combined features, the facility has also been ranked No. 1 in the nation in the "health promotion" category of the hot spring general election for three consecutive years from 2019 to 2021. As a hot spring where one can experience "health, beauty, and rejuvenation" at the same time, it is favored by people of all ages.

Radon Generator

Radon inhalation room

■Future Prospects: Contributing to the health of all people through the quality of the spring water

Mr. Yoshiteru Hayakawa, president of the company, commented on the occasion of the 80th anniversary as follows.

Since the establishment of the spa, we have been supported by local residents and customers from all over Japan, and today we are celebrating our 80th anniversary, a major milestone. I would like to express my heartfelt gratitude to all of you. We will continue to pursue the quality of our hot springs and realize our wish to 'make beautiful skin, rejuvenate from the cellular level, be close to people with intractable diseases, and make all people with illnesses healthy' through our hot springs. We hope that this commemorative event will allow more people to experience the qualities of our hot springs and help them to refresh their bodies and minds and improve their health.

The company will continue to pursue the intrinsic value of hot springs and contribute to local communities and health-conscious people throughout Japan by providing scientifically based hot spring therapy.

Mt. Fuji from the hotel

Outline of the 80th Anniversary Commemorative Project

◆80th Anniversary Commemorative Bathing Coupons

Date of sale: February 23, 2026 (Monday, national holiday)

Location: Ryuoh Radon Onsen Yutopia (1300-1 Tomitake-Shinden, Kai City, Yamanashi Prefecture)

Description ： One day trip bathing coupon ticket for 6 tickets

Price ： 4,290 yen (including tax) *Normal price 5,280 yen

Number of tickets sold: Limited (will end when sold out)

Expiration date ： Until the end of December 2026

Detail URL ： https://u-u.co.jp/blog/pickup/postid_8659/

◆Lactic acid bacteria "11-1" special sales

Sales period ： From Monday, February 23, 2026 (national holiday)

Discount rate ： 30% discount + visitors will receive a gift equal to the number of items purchased

Price example: 1 piece 6,853 yen (tax included, regular price 9,790 yen) + 1 gift for visitors

　　　　　 3 pieces: 19,250 yen (tax included, usually 27,500 yen) + 3 gifts for visitors

　　　　　 6 pieces: 36,960 yen (tax included, usually 52,800 yen) + 6 gifts for visitors

　　　　　 12 pieces: 69,300 yen (tax included, usually 99,000 yen) + 12 pieces for visitors

URL for details: https://u-u.co.jp/11-1/ (ID:111 PASS:111)

◆Line registration limited present campaign for 80 people

Application Period ： From Monday, February 23, 2026 to Tuesday, March 31, 2026

How to apply : After registering as an official LINE friend,

　　　　　　 and click on the application form link that will be displayed.

Official LINE : For individuals https://lin.ee/hvehM32

　　　　　　For corporate https://lin.ee/8b8E4XP

Present: 80 winners will be selected by lottery to receive either a special 6-pack of coupon tickets or a copy of the book "Building the Best Hot Springs in Japan" (Japanese only).

　　　　　　 A copy of the book "Let's Create the Best Hot Springs in Japan" (Japanese only)

Announcement of drawing: Prizes will be sent out in lieu of an announcement.

Book details: https://u-u.co.jp/blog/pickup/postid_7644/

　　　　　　 https://amazon.co.jp/dp/4594099963

Outline of the facility

Facility name: Ryuoh Radon Onsen Yutopia

Location ： 1300-1 Tomitake-Shinden, Kai City, Yamanashi-ken

Hours of operation: 10:00 - 23:00 (open year-round)

Regular fee: Adults 880 yen, children 770 yen / Overnight stay 7,700 yen and up

Access ： 14 min. walk from Ryuo Station on JR Chuo Honsen Line

　　　　　　 2.2 km west of Kofu Showa I.C. on Chuo Expressway

URL ： https://u-u.co.jp

Company Profile

Company name: Yutopia Co.

Location: 1300-1 Tomitake-Shinden, Kai City, Yamanashi-ken

Representative: Yoshiteru Hayakawa, Representative Director

Business description: Accommodation business

Company URL ： https://u-u.co.jp

X (former Twitter): https://x.com/radon_onsen

Instagram ： https://www.instagram.com/radon_onsen

YouTube ： https://www.youtube.com/user/utopia1213