Soak in the iki stove and groundwater cold plunge bath at a hideout floating in the skies above Sasazuka
Tokyo Shibuya City
"Tenku no Ajito Marushin Spa" is a men-only sauna facility open 24 hours a day, located on the 10th floor of a building in Sasazuka, Shibuya City, Tokyo. The sauna room is home to a large iki stove, where you can fully enjoy the powerful heat and steam created by self-löyly. Its biggest feature is the cold plunge bath filled with amber-colored groundwater drawn from beneath the building and luxuriously run continuously. It is also impressively deep, and its mellow feel on the skin gently envelops your overheated body. The view of Tokyo from the windows and the outdoor bathing space, where a pleasant breeze flows through, truly deserve to be called the city’s "hideout."
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
An authentic Finnish-style sauna centered around a Metos iki sauna stove. Self-löyly is available, and the steam from the aroma water quickly intensifies the heat in the room. Every Wednesday, a 110°C "strong setting" is also offered, earning overwhelming support from seasoned sauna enthusiasts.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath filled with amber-colored groundwater drawn from beneath the building and run continuously in luxury. With its moderate temperature setting and a tub more than 1 m deep, you can cool down your entire body gently yet thoroughly. The mellow feel of the groundwater against your skin is the kind of comfort that becomes addictive after just one visit.
Closed Days: None
10F, Marushin Building, 1-58-6 Sasazuka, Shibuya City, Tokyo 151-0073
Gender Access
Male Only
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn moreSoak in the iki stove and groundwater cold plunge bath at a hideout floating in the skies above Sasazuka
Tokyo Shibuya City
"Tenku no Ajito Marushin Spa" is a men-only sauna facility open 24 hours a day, located on the 10th floor of a building in Sasazuka, Shibuya City, Tokyo. The sauna room is home to a large iki stove, where you can fully enjoy the powerful heat and steam created by self-löyly. Its biggest feature is the cold plunge bath filled with amber-colored groundwater drawn from beneath the building and luxuriously run continuously. It is also impressively deep, and its mellow feel on the skin gently envelops your overheated body. The view of Tokyo from the windows and the outdoor bathing space, where a pleasant breeze flows through, truly deserve to be called the city’s "hideout."
Sauna TypeDry Sauna
Stove TypeConvection Stove (Sauna Stone)
Capacity12people
An authentic Finnish-style sauna centered around a Metos iki sauna stove. Self-löyly is available, and the steam from the aroma water quickly intensifies the heat in the room. Every Wednesday, a 110°C "strong setting" is also offered, earning overwhelming support from seasoned sauna enthusiasts.
Water QualityNatural Water (Groundwater, Spring, etc.)
Capacity4people
A cold plunge bath filled with amber-colored groundwater drawn from beneath the building and run continuously in luxury. With its moderate temperature setting and a tub more than 1 m deep, you can cool down your entire body gently yet thoroughly. The mellow feel of the groundwater against your skin is the kind of comfort that becomes addictive after just one visit.
Closed Days: None
10F, Marushin Building, 1-58-6 Sasazuka, Shibuya City, Tokyo 151-0073
Gender Access
Male Only
The above applies to the communal (shared) baths. At facilities with private baths or private saunas, guests with tattoos may still be able to bathe. Please check with the facility for details.
Curated by an expert who visits onsen and sauna facilities every day and has explored 300+ locations — only facilities confirmed to be truly exceptional are featured.
Learn more