Actually, as far as the Japan municipal websites go, I did a cursory search on several of them, but couldn't seem to find any that were quite that old. It seems that most of the cities I looked at have at least updated their sites since 2021, and they are all using the "city" subdomain, like https://www.city.inagi.tokyo.jp. The situation used to be much worse several years ago with municipal websites in Japan.

matigo.ca.