Totonou with the renovated powerful auto-löyly and binchotan cold plunge bath
Saitama Fujimino City
"Natural Hot Spring Manainoyu Oi Branch" is a day-use hot spring facility in Fujimino, Saitama Prefecture. Its weakly alkaline natural spring water is beloved as a "beautiful skin bath" that leaves the skin soft and moisturized. In December 2025, the men's sauna was renovated and equipped with auto-löyly that generates powerful waves of heat. With a spacious six-tier tower-style layout, it now offers an overwhelming sweating experience. The crisp cold plunge bath, lined with binchotan charcoal, feels gentle on the skin and is perfect for cooling down. Together with the open-air resting space in the outdoor area, it serves as a local hot spring hub where guests can deeply refresh both body and mind.
TypeNatural Hot Spring
A weakly alkaline natural hot spring that rises from underground. The water has a distinctive smooth, slippery feel and is highly regarded for its beautifying effects that leave the skin silky. In the outdoor rock bath, you can fully enjoy an open and relaxing soak while admiring the illuminated plants.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity25people
A large six-tier tower-style dry sauna renovated at the end of 2025. Auto-löyly is carried out at 15 and 45 minutes past every hour, and the rising wave of heat instantly fills the room, encouraging intense sweating. In a clean space filled with the scent of wood, you can enjoy bathing to suit your preference, from the intense heat on the top tier to the milder warmth on the lower tiers.
Sauna TypeSalt Sauna
Stove Typeconvection
Capacity10people
A steam sauna where you can refresh yourself by applying salt all over your body while being wrapped in abundant steam. The mild temperature places less strain on the body, allowing you to enjoy a thorough detox at your own pace. This soothing space is expected to help open the pores and leave your skin smooth and refined.
Water QualityCharcoal Filtered Water
Capacity8people
A spacious, refreshing cold plunge bath with binchotan charcoal built into the walls. Its defining feature is the soft feel on the skin created by the effect of the charcoal. The water is deep enough to thoroughly tighten a body heated by the sauna, leading to a crisp and invigorating totonou state.
Closed Days: None
〒356-0053 Saitama Prefecture, Fujimino, Oi 2-19-1
Gender Access
Gender Separated
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
Totonou with the renovated powerful auto-löyly and binchotan cold plunge bath
Saitama Fujimino City
"Natural Hot Spring Manainoyu Oi Branch" is a day-use hot spring facility in Fujimino, Saitama Prefecture. Its weakly alkaline natural spring water is beloved as a "beautiful skin bath" that leaves the skin soft and moisturized. In December 2025, the men's sauna was renovated and equipped with auto-löyly that generates powerful waves of heat. With a spacious six-tier tower-style layout, it now offers an overwhelming sweating experience. The crisp cold plunge bath, lined with binchotan charcoal, feels gentle on the skin and is perfect for cooling down. Together with the open-air resting space in the outdoor area, it serves as a local hot spring hub where guests can deeply refresh both body and mind.
TypeNatural Hot Spring
A weakly alkaline natural hot spring that rises from underground. The water has a distinctive smooth, slippery feel and is highly regarded for its beautifying effects that leave the skin silky. In the outdoor rock bath, you can fully enjoy an open and relaxing soak while admiring the illuminated plants.
Sauna TypeDry Sauna
Stove TypeInfrared Heater
Capacity25people
A large six-tier tower-style dry sauna renovated at the end of 2025. Auto-löyly is carried out at 15 and 45 minutes past every hour, and the rising wave of heat instantly fills the room, encouraging intense sweating. In a clean space filled with the scent of wood, you can enjoy bathing to suit your preference, from the intense heat on the top tier to the milder warmth on the lower tiers.
Sauna TypeSalt Sauna
Stove Typeconvection
Capacity10people
A steam sauna where you can refresh yourself by applying salt all over your body while being wrapped in abundant steam. The mild temperature places less strain on the body, allowing you to enjoy a thorough detox at your own pace. This soothing space is expected to help open the pores and leave your skin smooth and refined.
Water QualityCharcoal Filtered Water
Capacity8people
A spacious, refreshing cold plunge bath with binchotan charcoal built into the walls. Its defining feature is the soft feel on the skin created by the effect of the charcoal. The water is deep enough to thoroughly tighten a body heated by the sauna, leading to a crisp and invigorating totonou state.
Closed Days: None
〒356-0053 Saitama Prefecture, Fujimino, Oi 2-19-1
Gender Access
Gender Separated
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