A quiet valley public onsen surrounded by the clear Ashikawa stream and mountains
Yamanashi Kofu City
Kamikunoyu Fureai Center, located in the nature-rich mountain area of southern Kofu City, is a municipally operated day-use hot spring loved by the local community. A calcium-sodium sulfate spring gushes naturally from a fault 1500 meters underground, offering a gentle onsen that warms you from the core. In addition to a large communal bath and open-air baths that alternate weekly between a carbonated spring and utase-yu (cascading shower bath), the facility features a quiet dry sauna with no TV or background music and a continuously flowing groundwater cold plunge. The open-air cooldowns where you can feel the clear mountain air provide a uniquely luxurious healing experience.
Typeindoor
A calcium-sodium sulfate hot spring. The open-air baths alternate weekly between utase-yu (cascading shower bath) and a high-concentration carbonated spring, allowing you to relax while enjoying the mountain greenery.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity5people
A strong-style sauna completely free of TV and background music. With temperatures set around 94–100°C, it is a space where you can quietly sweat and reflect.
Water Qualitynatural
Capacity4people
A cold plunge continuously fed with groundwater. At an easy-to-enter temperature of about 19–20°C, it lacks a piercing chill and gently envelops the body.
Closed Days: Thursday
〒409-3712 1174 Koseki-cho, Kofu City, Yamanashi Prefecture, Japan
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
A quiet valley public onsen surrounded by the clear Ashikawa stream and mountains
Yamanashi Kofu City
Kamikunoyu Fureai Center, located in the nature-rich mountain area of southern Kofu City, is a municipally operated day-use hot spring loved by the local community. A calcium-sodium sulfate spring gushes naturally from a fault 1500 meters underground, offering a gentle onsen that warms you from the core. In addition to a large communal bath and open-air baths that alternate weekly between a carbonated spring and utase-yu (cascading shower bath), the facility features a quiet dry sauna with no TV or background music and a continuously flowing groundwater cold plunge. The open-air cooldowns where you can feel the clear mountain air provide a uniquely luxurious healing experience.
Typeindoor
A calcium-sodium sulfate hot spring. The open-air baths alternate weekly between utase-yu (cascading shower bath) and a high-concentration carbonated spring, allowing you to relax while enjoying the mountain greenery.
Sauna TypeDry Sauna
Stove Typefar_infrared
Capacity5people
A strong-style sauna completely free of TV and background music. With temperatures set around 94–100°C, it is a space where you can quietly sweat and reflect.
Water Qualitynatural
Capacity4people
A cold plunge continuously fed with groundwater. At an easy-to-enter temperature of about 19–20°C, it lacks a piercing chill and gently envelops the body.
Closed Days: Thursday
〒409-3712 1174 Koseki-cho, Kofu City, Yamanashi Prefecture, Japan
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