hmm dunno maybe you're talking about mekakucity actors?
oh vocaloids song some MVs about them, but they're called ''Kagerou project''
ah yes kagepro was my main fandom back then! but I don't think it's wannyanpu?? or the other artists who created it thank you for sharing! im pretty sure they make cute love story mvs and that there was a kinda mv series ?? like they're squad of boys and girls and two pairs? fell in love
if ya havent found it yet.. ur probably thinking of honeyworks
or this reminds me of, idk i watched vocaloi stuff years ago and saw an mv with similar art? it isn't vocaloid but jp song n mv was art is it her or does it just look like it? im sure that person was popular