Anonymous
I trained here for a day while traveling Japan. I went on a public holiday so admission was free (otherwise it's ~¥500). Two lanes are set aside for therapy walking; two lanes for lap swimming and the rest is an open area, without lane lines, but also used for lap swimming. The water temperature was slightly warm but not too uncomfortable for serious training. There are kick boards and the mandatory cap rule is enforced, but you can rent a cap, if needed. I had one of the lanes to myself for almost an hour while there from 6 to 7 PM on a Monday (also it was a public holiday).