It's odd to find a supersento without a homepage, but Akane no Yu is just one. (edit: found the webpage, it's a weird one that looks like it was made in 1998) I stumbled on this one thanks to a Google Maps search and randomly attending a badminton tournament at a nearby junior high school. Akane is a well built, large bathing complex and very much in place in the city of Kakogawa.One thing to realize is that this is not a real onsen. There is no well. Anything called "onsen" is made by adding minerals and chemicals to the water just like you might do at home. That aside, the water here was not bad at all. I really enjoyed the amount of carbonated or micro-bubble baths. Perhaps the best selection around of bubbly baths.The baths were in a compact, but well laid out area. Good tile work and stone around the baths. The washing area showed a little wear, but nothing to complain about. There were also many showers here.