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"Housed within a Japanese garden designed by landscape architect Kenzo Kosugi, this Nerima onsen focuses on a quieter, curated bathing environment that includes a central pool, outdoor Jacuzzis and a Finnish-style sauna that requires swimwear so couples can relax together. The facility prohibits children, making it oriented toward adult relaxation, and its proximity to a nearby amusement park offers convenient options for families to split activities." - James Wong