This autoplayed and wasn't looking at my screen so I just assumed it was a human cover and near the end of the song I looked at the title and realised this was Stardust! No matter how many times I hear her voice I'm blown away by how realistic she is.
She so prettyyyyy gahhhhh I also noticed her accent is very subtle, its only ever just barely noticeable when she pronounces her -u’s. Otherwise she sounds native ^^ Nice
Literally my fav Synth V cover to this day. Like, this could pass as a legit anime opening song with proper mixing and edited to fit the 1:30 minute TV restriction.