We stayed at other sister hotel, Kagari Kissho and visited for Kissho Spa.
They have couple massage called "Pair Course" for $20,000 for about 2 hours course.
WE instead took individual massage for $10K each with same couple room. Spa was brand new and BEAUTIFUL! I think they offered spa only visits (not staying), you can take their large bathroom too.
Hotel seems much better renovated than Kagari Kissho although Kagari Kissho has better location close to small downtown. I loved Kagari kissho's decor, it was beautiful.
Hotel offered to take back and forth to each hotel with hotel shuttle for spa use which was great service. I was very impressed with their service and definitely recommends to stay either one of them.More