A natural hot spring provides the water, but a rather over-active imagination provided the interior of this onsen theme park. Divided into a European and Asian half, the genders alternate between them each month. There is a mixed area on the roof including a pool – swimsuits are required for this part, but the rest is like a normal onsen (i.e. all naked). The place has a strict no-tattoo policy so keep that in mind if you have any that can’t be covered with plasters etc.

Entry for three hours is ¥2,400 while all days use is a littele extra at ¥2,700. On weekends and public holidays you have to add ¥300 to those figures and for late night use (between 12am and 5am) it’s an extra ¥1,300.