
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
New Japanese overnight train coming to connect Tokyo with Tohoku in sleep-travel style
7-Eleven Japan joins the craze for Korean Gamja Cheese Balls
Japan’s cheap beef bowl chain goes upscale with Matsuya Premium, but is it worth the higher price?
East Japan Railway announces plans to abolish magnetic-strip tickets
Anne Hathaway creates PR frenzy in Japan after mentioning Tottori in Devil Wears Prada interview
Shakey’s Japan creates matcha mochi, Kyoto fish, and Kansai Chili Con Carne pizzas
Two of Kyoto’s famous temples tackle streetside trash with solar-powered trash cans
New Square Enix Cafe reveals Final Fantasy, Dragon Quest, Nier, and Fullmetal Alchemist menu items
Super Mario Galaxy Happy Meal toys now available at McDonald’s Japan
Date handsome cockroaches in a new dating sim from one of Japan’s leading pest control companies
Even at twice regular Daiso price, this handy item is still great for summer travel in Japan
Ghibli’s No Face continues to demonstrate his generous character growth by dispensing soy sauce
Japanese rice cooker recipe gives us a tasty new way to enjoy vegetables and wieners
Family Mart commits “reverse fraud” in new Giant All-Star Festival, and we couldn’t be happier
New Tokyo sweets shop offers 648 different mochi ice cream dumpling combinations
Colour Hunting: The hot new street photography trend changing how we see Japan
Body of missing American college student found in Kyoto mountains
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Kanji ice cream becomes a sell-out hit in Japan
Uniqlo reveals third round of massive 100-year-anniversary manga T-shirts for Jump’s Shueisha
New official Ghibli anime food cookbook will teach you how to make Ponyo’s ramen and more
Japanese convenience store Lawson launches new “mini supermarket” chain, L Minimart
Japan’s real-world Pokémon hot spring’s first photos are here![Photos]
Kyoto public junior high school becomes first in Japan with a hoodie school uniform
Japanese convenience store shows us how to dress for the rainy season
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
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】
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
Pokémon and Ikea Japan cross over into each other’s worlds with collaboration events
Beautiful new Tokyo hotel gives you the best of both worlds with hot spring bath in the big city
Is the fountain of youth located in Japan? New study supports beauty claims of famous Japanese hot spring
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
Turn your cat’s toilet trips into day-spa visits with this adorable “onsen” litter box
Eight unforgettable hot springs, as recommended by Japan’s “Professor Bath”
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