Now that I re-read it. Those girls are VTuber and (V?)Singers (I assume VSingers since Nao is a producer after all)
A wise man once said, for any VTubers (and probably by extension, VSinger), distribute their traits in the pie chart of the following:
1. Not attractive
2. Chronic health condition
3. Mental illness
Now, these girls are all hot like hell (Not attractive ~ 0) without any sign of health condition (~ 0), that would leave only one option for trait distribution...
RUN, YOU FOOL!