Here I uploaded the filtered version of Toumei Ningen. I don't have any right to this, so I uploaded only some part of it to show some expamle. It's not perfect but very good anyway.
EDIT :
Ah, youtube video was dynamite out version. I uploaded adult version. kk
Anyway I found
karaoke dynamite out version preview of Toumei Ningen.
Site
https://www.clubdam.com/app/leaf/son...entsId=3594814
I compared it to youtube video. I think it's vocal filter, if another karaoke also sound like this I linked.