おはようトラベル The below are online lists of travel agencies in Japan with accessible tourism contacts. Although these are only in Japanese, we hope this information could be of some help to the readers.
https://www.jata-net.or.jp/travel/info/barrier-free/pdf/bfree_mamlist.pdf
https://www.ryokolink.com/travel/company_tm_barrierfree.htm
http://www.bari-net.jp/member/index.html
