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Anonymous
anonymous has looked into it for you.
The origin was niconico (JP video post not unlike youtube)
as far as I can tell Someone megamixed a ton of karaoke versions of 33 game and anime songs together and posted it
then random viewers started attempting singing all 33 songs and posted it
someone else, possiblely the original poster, started editing versions together to the video. Lots of crazy singing talent in the pool.
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