A year-long hot-spring stamp rally across Aomori, the prefecture with the most public baths per resident in Japan. Clear a region's onsen to be certified a Yukko Meijin, and all 53 to master the whole prefecture.
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Aomori Onsen-do (青森温泉道, "the way of Aomori's hot springs") is a year-long hot-spring stamp rally run by the Aomori no Yukko Association (青森の湯っこ協会), a group of local onsen fans that grew out of the "Dosa-Yu Club" (どさ湯さ部) community. Aomori has the highest number of public bathhouses per resident of any Japanese prefecture, and this rally is the enthusiasts' celebration of that: a single stamp book that walks you across the whole prefecture, one bath at a time.
The 2026 round runs from February 6, 2026 to February 5, 2027, timed to the once-in-a-millennium "Year of the Bath" pun (お風呂 = 026).
The rally is compatible with other stamp rallies, so a single bath can count toward more than one.
Where to apply and redeem (by February 6, 2027): Aburakawa Onsen (Aomori City) and Furuoppe Onsen (Hirakawa City) for Tsugaru, Fukuda Onsen (Nanbu Town) for Nanbu, and any of the three for the all-prefecture rank.
Onsen Oni mirrors all three ranks as repeatable badges: Tsugaru Yukko Meijin, Nanbu Yukko Meijin, and the apex Aomori Yukko Meijin. Complete a region (or the whole prefecture) and claim the matching badge here.
The list on this page is matched to Onsen Oni's own catalog, so each facility links through to its full page with map, hours, and details. Hours come from each facility's public listing and can change seasonally; the official campaign site has the most current participation details.