Kirk here, asking "Sento, anyone?" The website (which contains a Google map showing the location) for this sento is
https://yoyasu.kuma1010.com
https://japan-forward.com/hidden-wonders-of-japan-sento-in-kumamoto-welcomes-foreigners-to-bathe-with-mascot/
[Hidden Wonders of Japan] Sento in Kumamoto Welcomes Foreigners to Bathe with Mascot | JAPAN Forward
Yoyasuyu, a public bathhouse in Kumamoto, has been temporarily decorated with illustrations of Kumamon, the adorable bear that serves as the region’s publicity mascot.