[TTNE] "Totonoe Oyakata" and "Sauna Shisho" to Continue as Global Sauna Ambassadors for World's No. 1 Sauna Brand HARVIA for the 4th Consecutive Term!

Left: Totonoe Oyakata (Daisuke Matsuo) Right: Sauna Shisho (Daisuke Akiyama)

TTNE Co., Ltd. (Headquarters: Minato-ku, Tokyo), a creative sauna collective, is pleased to announce that our "Totonoe Oyakata (Daisuke Matsuo)" and "Sauna Shisho (Daisuke Akiyama)" have been reappointed as Global Sauna Ambassadors for HARVIA, the world's No. 1 sauna & spa brand, for the fourth consecutive term.

From left: Seiji Kasama, CEO of Harvia Japan; Totonoe Oyakata; Mathias Järnefelt, CEO of Harvia; Sauna Shisho.

Background of Continued Global Ambassadorship and New Approach for 2026

HARVIA is a global brand in the sauna & spa field, headquartered in Finland and operating in over 80 countries worldwide.

With its high quality and excellent technological capabilities, it has earned strong support from sauna enthusiasts and professionals around the world, boasting the No. 1 market share in the industry. In Japan, the company operates its local subsidiary, HARVIA JAPAN Co., Ltd., providing distribution and support for Harvia products.

Totonoe Oyakata (Daisuke Matsuo) and Sauna Shisho (Daisuke Akiyama) were appointed as HARVIA's first-ever Global Sauna Ambassadors in 2023.

Since then, they have been working to develop and promote sauna culture not only in Japan but also in various parts of the world, acting as a bridge for the international sauna community. In 2026, their fourth year in the role, they will transition to a more reformative "phase of exporting Japanese sauna culture to the world."

Most recently, in June 2026, they spoke at the "World Sauna Forum 2026" held in Finland, where they presented Japan's unique concept of "totonoi" (a state of deep relaxation and well-being) and cutting-edge creativity to the world, receiving a significant response.

This term, they will further leverage their accumulated knowledge and achievements to promote "unique Japanese sauna culture" to the world in collaboration with HARVIA.

Comments from Totonoe Oyakata (Daisuke Matsuo) and Sauna Shisho (Daisuke Akiyama)

Totonoe Oyakata (Daisuke Matsuo)

"I am deeply honored to serve as HARVIA Global Sauna Ambassador for the third consecutive year. Japanese sauna culture has a value that we can be proud of to the world. Together with HARVIA, I want to continue contributing to people's happiness and health through saunas."

Sauna Shisho (Daisuke Akiyama)

"Sauna is not just a bathing culture; it is communication that connects people to people, people to nature, and people to themselves. With the growing global interest in saunas, I want to deliver the unique experiential value of Japan to the world."

About HARVIA

The world's No. 1 brand for saunas & spas, with high safety and a reliable support network.

Founded in 1950 in Finland, the home of saunas, Harvia is a global market leader in the sauna & spa industry, enjoying an overwhelming share and high reputation in the sauna heater market in Finland and other European countries. With a mission to provide well-being through the various effects of sauna heat, the company currently partners with over 200 companies and supplies sauna & spa products to 90 countries worldwide.

HARVIA JAPAN conducts rigorous inspections that meet the standards of the Electrical Appliance and Material Safety Act for all sauna heaters under 10kW sold in the Japanese market, displaying the <PS>E mark. Only products with proven safety are sold.

Furthermore, with Harvia Sauna Dealers nationwide that operate showrooms and handle sales, installation, and maintenance, customers can purchase with confidence after seeing, touching, and experiencing the products, and receive prompt after-sales support.

Harvia is the world's No. 1 brand for saunas & spas, ensuring peace of mind for both home and business use.

About [TTNE]

[TTNE] is a creative sauna collective led by Totonoe Oyakata (Daisuke Matsuo) and Sauna Shisho (Daisuke Akiyama), continuously driving innovation in saunas.

The group has launched various sauna projects, including producing over 100 sauna facilities, the pioneering sauna specialty brand shop [TTNE], the "Japan Sauna Society" for medical research with over 500 registered medical professionals, "SAUNACHELIN," one of Japan's largest sauna ranking sites with over 1 million PV annually, the world's first sauna-specific World Sauna Awards "SAUNA37," and the specialty select e-commerce shop for sauna goods "SAUNA SELECT," offering a curated selection of home saunas and sauna stoves from around the world.

As the only "PREMIUM SAUNA PARTNER" recognized by the world's No. 1 sauna brand HARVIA, they operate sauna dealerships nationwide and, as the world's first "Harvia Global Ambassador," strive to improve sauna culture both domestically and internationally, working hard for saunas.

Totonoe Oyakata

Totonoe Oyakata (Daisuke Matsuo) - Professional Saunner

An entrepreneur and professional saunner who produces sauna facilities nationwide while managing multiple companies. He is known as "Totonoe Oyakata" for guiding many people to a state of "totonoi." Together with Daisuke Akiyama (Sauna Shisho), he founded the sauna creative group "TTNE" and the "Japan Sauna Society," engaging in various fields within the sauna industry. He also serves as the world's first "Harvia Global Ambassador," developing innovative sauna spaces integrated with architecture and design both domestically and internationally. His publications include "Sauna Techniques to Change Your Life."

Sauna Shisho (Daisuke Akiyama) - Professional Saunner

A professional saunner active on the world stage while managing a branding company focused on events. He has produced Japan's largest sauna events and awards, as well as innovative sauna spaces. He served as the general producer for the Expo Sauna "Tsubomi of the Sun," a main event at the 2025 Osaka-Kansai Expo. Appointed as a Global Ambassador by the world's No. 1 sauna brand "Harvia," he is recognized internationally as a key figure leading Japanese sauna culture into the future. By combining Japanese sensibility with a global perspective, he is creating a next-generation sauna culture connected to the world.

Sauna Shisho

<Official Websites>

TTNE : https://ttne.jp

Sauna Specialty Brand SHOP [TTNE] : https://www.ttne.shop

Japan Sauna Society : https://www.ja-sauna.jp

SAUNACHELIN : https://www.saunachelin.com

SAUNA37 : http://sauna37.com

SAUNA SELECT : https://sauna-select.com

HARVIA : https://harvia.jp/

Totonoe Oyakata Instagram:https://www.instagram.com/totonoeoyakata

Sauna Shisho Instagram:https://www.instagram.com/saunashisho

[Contact for Inquiries]

TTNE Co., Ltd. Contact: Kakuzaki

Email: shiyo@ttne.jp

Tel: 03-5843-7576