
Do you love hot springs and spas? How about Tokyo? If so, we have good news for you! A new onsen (hot spring) spa, the largest in Tokyo, is currently under construction right here in beautiful Shinjuku! Even better, it’s set to open at the end of July.
We were so excited about this ginormous new relaxation spot, we sent a writer to check out the new spa, called Thermae-yu, to see how it’s looking these days. Along the way we learned a certain secret that’s not actually a secret, but may disappoint die-hard onsen fans.
The official RocketNews24 headquarters/offices/secret superhero base is, in case you didn’t know, also located in Shinjuku. We won’t give you the exact address, but we will say this: The power was in you all along. More importantly, the office isn’t terribly far from the location of Thermae-yu, which is nearly ready for the public, so Yoshio, one of the dashing writers for RocketNews24 Japan, decided to go check it out.
▼ It’s not particularly exciting yet, is it?
The future spa is close to Hanazono Shrine and located next to the Shinjuku Yuhodo Park’s Four Seasons Pathway (新宿遊歩道公園 四季の路, or “Shinjuku yuhodo koen shiki no michi” in Japanese), pictured below, giving the area a nice, lush green feel. That certainly sounds like a great place for a “natural” onsen spa! In addition to the nice location, the building has two underground floors and four above-ground floors, making it the largest in Tokyo.
However, you’ll notice we used quotation marks with the word “natural.” Apparently, there aren’t any actual hot springs at Thermae-yu — but it turns out there will be real hot springs water at the spa!
Wait, what?
▼ Is this magic? Do they have a contract with Gandalf?
While it’s not quite sorcery, it’s also not quite the same as a regular hot spring. It turns out water will be transported to the spa everyday from real hot springs. This sort of thing is actually pretty common with urban onsen complexes, with many of them making trumpeting the exact locations where they hot spring water comes from (Thermae-yu hasn’t officially announced where it’s sourcing its water from). Thermae-yu’s website indicates that the water will be “heated, diluted, circulated, and purified” to maintain its quality, which actually doesn’t sound like a bad idea. But it’s also not exactly what you think of when you think of onsen.
So, if you’re a die-hard onsen-lover, this might be a bit of a disappointment. On the other hand, if you just want to relax a bit in Shinjuku, this honestly sounds like a decent compromise. Entry fees and the like haven’t been announced yet, and while Thermae-yu’s main target is women, men will be allowed entry as well (the bathing areas are gender-specific). So if you’re looking to wash off after a day of shopping and karaoke in Shinjuku, this looks like it will be a great place to soak before catching the train home.
Location information
Thermae-yu / テルマー湯
Address: Tokyo-to, Shinjuku-ku, Kabukicho, 1-1
東京都新宿区歌舞伎町1丁目1
Website
Images © RocketNews24






Natural hot spring bathhouse in Tokyo’s Kabukicho is a super-cheap place to stay
2018 Top 20 Day Trip Onsen Hot Spring and Spa Ranking in Japan
Tokyo hot spring allows guests with tattoos to bathe… with some very odd restrictions
Love hot springs and tattoos? You won’t want to miss this onsen paradise near Tokyo!
The top 10 hot springs Japanese travelers want to visit this fall
10 times to avoid traveling in Japan in 2026
We ate sushi made from Japan’s most expensive tuna ever【Taste test】
Ramen restaurant’s English menu prices are nearly double its Japanese ones, denies discriminating
New Japanese menstrual product seeks to help women spot unidentified iron deficiencies
This quiet forest cafe in Japan lets you read all day in the house of a famous author
Nearly one in ten young adults living in Japan isn’t ethnically Japanese, statistics show
“Hey, Japanese taxi driver, take us to the best chanpon noodles in Nagasaki!”
Tokyo’s super-secret-location sushi restaurant has a stand-up sister shop that’s open to all
Here’s what our bachelor writers ate over the New Year’s holiday in Japan
Japan’s number-one cosplayer Enako creates jaw-dropping crowd at Winter Comiket【Photos】
Japanese beef bowl chain Sukiya’s 2026 Smile Box lucky bag basically pays for itself
Starbucks Japan ready to get Year of the Horse started with adorable drinkware and plushies【Pics】
Hayao Miyazaki says Happy New Year to Studio Ghibli fans with new art for Year of the Horse
Cup Noodle tries an authentic Jiro-style ramen, but something’s not quite right
Top Japanese cosplayer Enako returns to Comiket after 6 years, creates mayhem with admirers
The best Starbucks Japan Frappuccinos we want to drink again in 2026
We revisited Sweets Paradise after a decade to see if Japan’s dessert buffet still delivers
That time Seiji called JASRAC to ask why he didn’t get paid royalties for his song being on TV
Pizza Hut Japan’s hot lucky bags are perfect for a New Year’s pizza party
Majority of Japanese mayors say foreign residents are essential but most see good and bad effects
7-Eleven Japan starts new temporary luggage storage service in over 300 branches
Disillusionment at Tsukiji’s tourist-target prices led us to a great ramen restaurant in Tokyo
Starbucks teams up with 166-year-old Kyoto doll maker for Year of the Horse decorations【Photos】
Tokyo considering law requiring more trash cans following litter increase in heavily touristed area
Tokyo’s Tsukiji sushi neighborhood asks tour groups to stay away for the rest of the month
Tokyo event lets you travel back in time, for free, to celebrate 100 years since Showa era start
Japan may add Japanese language proficiency, lifestyle classes to permanent foreign resident requirements
Sanrio theme park in Japan announces plans to expand into a Sanrio resort
Lacquerware supplier to emperor of Japan and Pokémon team up for new tableware
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Japan’s deadliest food claims more victims, but why do people keep eating it for New Year’s?
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Starbucks Japan reveals new sakura drinkware collection, inspired by evening cherry blossoms
Updated cherry blossom forecast shows extra-long sakura season for Japan this year
Is the fountain of youth located in Japan? New study supports beauty claims of famous Japanese hot spring
Beautiful new Tokyo hotel gives you the best of both worlds with hot spring bath in the big city
Five of Japan’s most unique snow-covered hot spring bathing sites
Hot Spring Lovers Rejoice! Three Unique Onsen Resorts to Try Before You Die
Massive hot spring theme park coming to Osaka Bay Hotel, a dream come true for onsen lovers
Ibaraki Prefecture promotes onsen hot springs with muscly man bathing in 4K【Videos】
America has hot springs too! Our Japanese reporter puts one to the test
The 10 best hotel hot springs in Japan, as chosen by Japanese travelers
Take the “Public” Out of Public Bathing and Make a Natural Hot Spring in the Comfort of Your Own Home
Hot springs website reveals the most popular user-picked onsen in all of northern Japan
Eight unforgettable hot springs, as recommended by Japan’s “Professor Bath”
Turn your cat’s toilet trips into day-spa visits with this adorable “onsen” litter box
Hidden gem in Tokyo: Black water hot spring hotel
18 awesome overnight hot spring trips from Tokyo, and a quiz to help pick the best one for you
Capybara hot springs are back: Rodent-friendly onsen now available all over Japan
Secret tent onsen in the forest is one of the most unusual hot springs in Japan
Leave a Reply