Japan's Largest Sauna Festival! 'Setouchi International Sauna Festival 2026 – Kairo Netsu Power Festival' to Feature 13 Saunas and 7 Cold Plunge Pools

Kotohiki Kairo, a natural hot spring facility in Kanonji City, Kagawa Prefecture operated by Zan'ki Renga Co., Ltd., will host the sauna festival 'Setouchi International Sauna Festival 2026 – Kairo Netsu Power Festival' on Saturday, September 12, 2026.

This event will feature not only Kotohiki Kairo’s diverse saunas and cold plunge pools but also limited-time sauna experiences. Guests can enjoy a total of 13 saunas and 7 cold plunge pools, along with a large pool, SAUNA FOOD & BAR, a DJ booth, and Aufguss sessions by guest heat masters—making it enjoyable not only for sauna enthusiasts but also as a summer leisure event.

Don’t miss this one-day-only sauna festival at the 'Sauna Kingdom' with panoramic views of the Seto Inland Sea.

Three Highlights of the 'Setouchi International Sauna Festival 2026'!

① Prestigious Guest Heat Masters Unite! The 'Netsu Power Festival' Led by Trendsetting Heat Masters

Guest Heat Master: Kota Iwaki

The highlight of this event is undoubtedly the star-studded lineup of heat masters. Renowned guest heat master Kota Iwaki, known for his appearance on ABEMA’s 'Love Power Kingdom 2,' will be joined by approximately 10 heat masters performing Aufguss sessions across the venue.

37-Minute Continuous Crazy Heat Wave 1

37-Minute Continuous Crazy Heat Wave 2

During the signature '37-Minute Continuous Crazy Heat Wave,' heat masters will continuously pour heat without rest, driving the venue’s energy to its peak. Combined with '37 Types of Aroma Loulou,' guests can experience an unparalleled 'Kingdom of Heat' found nowhere else.

② Enjoy 13 Saunas and 7 Cold Plunge Pools to Your Heart’s Content

Ship Sauna

On the day of the event, in addition to Kotohiki Kairo’s diverse saunas, limited-edition saunas will also be available.

Guests can enjoy a variety of unique saunas all at once, including ocean-view saunas overlooking the Seto Inland Sea, wood-fired saunas, tent saunas, and sauna cars.

Setouchi Lemon Sauna

The cold plunge pools also feature a unique lineup, including seawater plunge pools, hot spring water plunge pools, solo plunge pools, and giant barrel plunge pools.

Enjoy the ultimate 'Totoi' (post-sauna relaxation) while touring saunas and cold plunge pools with views of the Seto Inland Sea!

③ Maximum Festival Vibe: Large Pool, DJ Booth, and Delicious Sauna Cuisine!

Non-sauna content is also fully packed! A large pool will be set up on-site to soothe bodies heated to the extreme in saunas, allowing guests to enjoy a resort-like atmosphere in swimsuits.

Large Pool

Additionally, a 'DJ Booth' will be installed within the venue. Guests can enjoy an ultimate chill time, listening to pleasant music, sipping cold drinks, and enjoying impactful sauna cuisine from 'SAUNA FOOD & BAR' while admiring the breathtaking views of the Seto Inland Sea.

DJ Booth & Pool

Gourmet Sauna Cuisine

Event Overview: 'Setouchi International Sauna Festival 2026 – Kairo Netsu Power Festival'

Date & Time: Saturday, September 12, 2026

'10:00–14:00 (Session 1)', '15:00–19:00 (Session 2)'

Venue: 6-6 Ariake-cho, Kanonji City, Kagawa Prefecture 768-0062 (Natural Hot Spring Kotohiki Kairo)

Admission Fee: Advance Ticket 3,700 JPY / Same-Day Ticket 5,000 JPY (tax included)

※ Includes admission to Kotohiki Kairo. If advance tickets sell out, same-day tickets will not be sold at the venue.

※ Same fee applies to elementary school students and above. Preschool children are free, but they must use the same lockers as adults.

※ Minors cannot attend without an adult.

Advance Ticket Purchase Site: https://reserve.489ban.net/client/kotohiki-kairo/0/plan/daytrip#content

What to Bring: Swimsuit (T-shirts or similar may be worn over swimsuits), sandals, towel, poncho (recommended), sunglasses (recommended)

Note 1: Tattoos must be covered so they are not visible to other guests. Entry with visible tattoos is not permitted, and ticket fees will not be refunded.

Note 2: Professional photographers will be present on-site. Photos taken may be used for future PR purposes. Please understand and agree to this.

Note 3: Tickets cannot be canceled 10 days or fewer before the event. No refunds will be issued for cancellations during this period.

Kotohiki Kairo Official Website: https://kotohiki-kairo.co.jp/

Kotohiki Kairo Official Instagram: https://www.instagram.com/kotohikikairo_official/

※ Event details are subject to change. Any changes will be announced on Kotohiki Kairo’s official Instagram.

Saunas Available on the Day (13 Types)

· Setouchi Lemon Sauna (A sauna inspired by Norwegian facilities, offering the scent of Setouchi lemons)

· Kama Sauna (An ancient Japanese-style sauna that recreates a traditional Japanese steam bath passed down for over 1,200 years)

· Tuli Sauna (A sauna inspired by Finnish facilities, themed around fire)

· Ship Sauna (A ship-shaped ocean-view sauna inspired by Norwegian facilities)

· Ariake Sauna (A spectacular ocean-view sauna with a panoramic view of one of 'Japan’s 100 Best Sunsets')

· HIISI Sauna (A tent sauna featuring a distinctive hexagonal shape, made in Finland)

· Ibuki Sauna (A barrel sauna offering scenic views, inspired by Ibuki Island floating in the Seto Inland Sea)

· MORZH MAX Sauna (A spacious Russian tent sauna designed for large groups)

· MORZH Sauna (A Russian tent sauna allowing bathers to enjoy views of the Seto Inland Sea)

· Dome Sauna (A dome-shaped sauna with a 3-meter diameter)

· Sauna Car37 ~Electric~ (A domestically produced sauna car equipped with an electric sauna stove)

· Ocean-View Wood-Fired Sauna Mini (Event-exclusive / authentic wood-fired sauna with a wood-burning stove)

· Ocean-View Wood-Fired Sauna Max (Event-exclusive / wood-fired sauna overlooking the Seto Inland Sea)

Cold Plunge Pools Available on the Day (7 Types)

· Setouchi Seawater Cold Plunge (A seawater cold plunge pool filled with water drawn from the Seto Inland Sea)

· Onsen Cold Plunge (A cold plunge pool using naturally cooled hot spring water)

· SSS Cold Plunge (A solo cold plunge made of Shigaraki pottery, perfect for individual use)

· Single Cold Plunge (A single cold plunge equipped with a chiller capable of cooling up to three times)

· Sake Barrel Cold Plunge (A cold plunge renovated from a sake barrel previously used in a sake brewery)

· Soy Sauce Barrel Cold Plunge (A barrel cold plunge renovated from a giant soy sauce barrel with a diameter of 240 cm)

· Tetsu Cold Plunge (A solo cold plunge made from an iron drum, perfect for individual use)

About 'Love Power Kingdom 2' featuring Kota Iwaki

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ABEMA 'Love Power Kingdom 2'

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