Board Thread:Off-Topic Discussion/@comment-1676371-20180513053832/@comment-53539-20180524123949

It seems she has been in use for some time privately, so she is a private vocal like Project 575 that's gone commercial.

I did myself previously note that late engine releases tend to be mostly products too far to be restarted or ones that can't wait in general for the next engine. Chika seems to have been that kinda of vocal.

I will not that in regards to Ryuto, he wouldn't have been able to wait for v4 as he was done for a anniversary that came before V4. Internet was reported uninterested in an update for him at all. So his release is pretty much only due to that anniversary.