Could this be Star Ring's Uyu Hitori?
Compare the voice in the
debut teaser with
this clip.
In particular the extended "-mase" at
0:12 in the teaser and at
3:51 in the clip
As Star Ring is now defunct they deleted all the company account tweets, and their habit was to wipe talent YT and twitter on graduation, so I don't have much to go on, just voices. Also to search her properly you need to use 烏遊ヒトリ
She graduated June 2023, which kind of lines up correctly. ...
around the same time as Beryl... who might be Clara, on the days the rrats are winning