Solaniwa Onsen

A super sento that costs from 2460 on weekdays, and a whopping 3780 on holidays. Large grounds — at the entrance you get to choose a yukata (several men's and women's options), and you walk around the entire facility in a yukata. The onsen zone isn't huge, but the water is supposedly 100% natural and undiluted. On the premises there's an arcade, a shooting gallery, and restaurants. Overall, feels like being in an anime at some kind of festival. (There's also kashikiri — officially only available to families, but as the staff said, nobody actually checks.)

Super sento. Has massage, a food area, an arcade game area, a rooftop garden, and chill zones. By the bridge they were putting on some kind of mini show with a guy for everyone. I think there was also a cave sauna. Admission is around 3,000 yen. They give you a small and large towel, a bag, and a yukata. Two bath zones. Indoor section includes: - small cold water bath; - silk bath, water is white with white spots, temperature showed 40; - small rectangular bath with round wooden balls floating in it; - large rectangular bath with a view through a fence and glass toward the garden, temperature showed 40 degrees. Outdoor section includes: - bath supposedly with carbonated water, temperature showed 37; - stone bath at 40 degrees; - another stone bath at 42 degrees labeled as 100% natural hot spring. Water except for the silk one is clear-greenish, I don't particularly remember the smell. On January 1st there were lots of people, but the infrastructure handles it fine. The post-bath massage was excellent. Considering the location and my limited super sento experience - I liked it, it was good, and the crowd didn't bother me.