Claims to be the first capsule hotel in the world. Could be true. Great big pool to swim around in on the first floor plus a HUGE sauna. On the second floor is a more typical bathing experience. On occasion a hidden rooftop outdoor bathing area is open. Great if you are stranded in Osaka after the last train has left, you need to spend a night away from it all, or you are just traveling through. If you just stop in for the 50 minute quick bath plan it is also pretty good as there is not much in terms of a normal sento in the neighborhood.