for sauner is a reservation-only sauna in Nishinakasu that caps its indoor DOME SAUNA at nine guests, each with their own reclining chair. The dome-shaped hot room is paired with a lie-down cold bath of soft water and a body dryer. DOME SAUNA is men-only apart from regular ladies' days and costs ¥3,300 for 80 minutes. A separate rooftop sauna is hired privately by groups in swimwear, from ¥24,000 for two hours.