Amazing bathhouse just a few minutes walk away from Naebo station, which is just a few minutes train ride from Sapporo (JPY200, one stop). It is open till midnight, though 11pm is last entry and you can only purchase items from vending machines after that time as everything else closes shop. The price for adult has recently been adjusted to JPY490 (since October 2023), but it is worth every yen, excellent value for money.

As you enter, take off your shoes, choose a shoe locker, put in shoes, put in a JPY100 coin, and remove the key. This JPY100 coin will be returned to you when you insert the key to open the locker later. Next, go to the ticket machine and select the tickets you need (e.g. how many adults/children), and also whether you need to rent/buy towels or other items. Pay at the machine, take ticket, bring it to the counter, and collect anything you have rented/purchased. If you brought your own towel then proceed to the changing area according to gender. Inside the changing area, you will find more lockers, repeat the same thing you did with the shoe locker, except this time it's for all your other belongings, Including all the clothes you are wearing. Undress completely, keep your things in the locker, and put in another JPY100 coin that will be returned to you later. Proceed to bathing area, shower first, and after that it's up to you how you want to experience it.

During our visit, the hottest indoor pool was 43°C, followed by 41°C, and also a bubbly pool that is 39°C. There is a sauna room that is 92°C, and a cold pool right outside the sauna at 14-15°C. There are also two outdoor pools at 42°C and 41°C respectively, the slightly lower temperature one being built into a cave design. The outdoor pool is perfect for cold weather. Shampoo and shower gel are provided in the bathing area, so you don't have to bring your own, though you might notice many of the locals do.

Some comments mentioned about no tattoo policy, it is displayed at the entrance, but I did notice people with tattoos in the bathhouse, so I am not exactly sure what the deal is. I have no tattoo, so the policy does not affect me. Highly recommended.