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国内は情報統制がかかるから、海外メディア、人権団体への「報告」これだけやればいい

Big News; Tokyo Olympic discrimination problem

What Oyamada did.
Ghastly traumatic bullying/torturing to disabled person
by Tokyo olympic opening ceremony musician ,
Keigo Oyamada.

(English. Original source is Japanese music magazine "Rocking on Japan" published in January 1994. )
http://oymdkig.blog.fc2.com/blog-entry-2.html

Also check public newspapers for more reliable source. (Japanese)
https://mainichi.jp/articles/20210716/ddm/012/050/119000c