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Kosugi-yu in Koenji is easily accessible from Shinjuku and has long been a favorite among travelers and locals alike. This nearly century-old wooden sento offers a rejuvenating experience for just ¥550.

The Koenji location features four distinct baths: a medicated bath, a massage jet bath equipped with three jets, a milky water bath, and a small cold bath. Your only concern is bringing a small towel, although rentals are available on-site.