The mail submission form is available in following web page.
ttp://www.city.osaka.lg.jp/shimin/page/0000339042.html
Osaka Prefecture Osaka Municipal Civic Bureau Diversity
Promotion Office Human Rights Planning Division
Phone number when calling from Japan : 06-6208-7612
Phone number when calling from outside Japan : +81 6 6208 7612
Fax number when calling from Japan : 06-6202-7073
Fax number when calling from outside Japan : +81 6 6202 7073
Address: 4th Floor Osaka City Hall, 3-20 Nakanoshima Kita Ward, Osaka City, Osaka
530-8201 Japan