It looks like those Uto + Nabi & Senpai threads are dead now and I don't feel like making a thread just for this so I'll just drop this here. I'm like 90% sure this chuuba is the reincarnation of Aoi Mizuki, formerly of the infamous Voice-Ore.
https://www.youtube.com/watch?v=6eZkvIonmuMLooks like she either joined another startup company or just said fuck it and made it herself.