Prus Sauna

About

Prus Sauna occupies a floor of Tokyu Kabukicho Tower — Shinjuku's newest entertainment monolith — and it represents a sharp departure from Tokyo's communal bathing tradition. Here, the sauna is private. You book a room. The door closes. And then the magma does its work. The heating technology uses plates of volcanic stone sourced from Mt. Fuji's lava fields, producing far-infrared radiant heat that penetrates deeper than conventional sauna elements. The sensation is distinct: less surface burn, more internal warmth, as if the heat originates from inside your body rather than the room. Each room includes its own cold plunge — a private contrast cycle that removes the social negotiation of shared facilities. For couples, this is the appeal: a genuinely intimate wellness experience in a city where most bathing is communal and gender-separated. The rooms are designed with Shinjuku's skyline as the backdrop — floor-to-ceiling windows that frame the city's vertical ambition while you sit in prehistoric volcanic heat. The contrast between the view and the experience is poetic in a way the designers clearly intended. Prus Sauna is part of the XPLACE concept — a "wellness third place" that sits alongside Kabukicho Tower's hotels, cinemas, and entertainment venues. The idea is that sauna belongs in the same ecosystem as dinner and a movie, not sequestered in a suburban spa. The pricing reflects the private, premium positioning — this isn't a daily habit facility. It's an event, a date, a treat. And for that specific use case, the combination of volcanic heat, cold water, and city views delivers something no other Tokyo venue offers.

Treatments & Services

Signature: Private magma sauna session with Shinjuku skyline panorama

Highlights

• ✓Private magma saunas with Mt. Fuji lava stone plates
• ✓Cold plunge rooms
• ✓Shinjuku skyline views from Kabukicho Tower
• ✓Part of XPLACE wellness third place concept
• ✓Individual and couple room options