Note that the voucher must be redeemed before using. I opted to redeem at Harajuku Tourist Information Center (close to Takeshita Street) and went there on Monday afternoon by a free shuttle bus service from Tokyo Teleport St. There were not so many people making me able to try every single bath comfortably.

Warm hot spring with beautiful panorama during winter...

Oh my...! this is one good different experience one must have in Japan! It was 6 of us and all of us were happy. First we have to redeem a physical voucher at JTR counter at narita terminal 2. In arrival hall, when you see starbuck on the left, just walk to the right (do not take the elevator down). The counter is on the left hand side, small counter you might miss the sign if you don't carefully see. With a set of kimono and hotspring pool, this surely a must try experience!