This isn't Kumamoto specific, but it's as much a part of life here as it is in the rest of Japan. :)
-- Kirk
https://www.youtube.com/watch?v=LC5Dr9lV6ro
Japan Has The Robo-Toilets Of The Future | Elise Tries | NPR
Japanese toilets have come a long way from the early 20th century, when many people still used "squatters," which were commodes built into the floor to squat...