Where was Sumo Do, Sumo Don't filmed?
1992 film by Masayuki Suo
Sumo Do, Sumo Don't (1992) was filmed in Oyama and Mamada Hachimangu, 2 places named in its Japanese Wikipedia’s 製作 section, in Japan. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Japanese Wikipedia's 製作 section
Japanese Wikipedia’s 製作 section names 2 places. Each links to the sentence that says so.

