Just when you thought things couldn't get much worse for the Tokyo 2020 Summer Olympics, Keigo Oyamada -- one of the composers for the opening ceremony -- has pulled out ... following claims he bullied a disabled classmate.
Even worse -- he made the claims himself ... in interviews back in the 1990s.
It's truly disturbing, but Oyamada -- now 52 years old -- once bragged to local news media that he forced a disabled boy to masturbate in front of others and eat his own feces.
The interviews were conducted when he was not yet famous, but they resurfaced recently when it was announced he would be involved in the opening ceremony.
Oyamada -- who writes under the name "Cornelius" and is popular in Japan for creating the Shibuya-kei beat -- has apologized for his "very immature" behavior ... and is backing out of the gig.