It depends. The group songs are mostly prerecorded but some girls prefer doing them live:
I checked /vt/ for this korekore stream about the Niji stuff:
A mixer named
YAB who did a lot of mixing for real idol groups like AKB48, Nogizaka46 or Sakurasaka46 but also for vtubers like Nijisanji (Mito, Lize, Ange etc) allegedly
- took creep pictures of livers and shared them in group chats to laugh at them (and maybe using them for blackmailing)
- spiked their drinks with some chinese aphrodisiac or other shit
Ienaga Mugi deleted an old tweet from 2020 about how she felt sick and threw up when she was recording stuff and this dude was present at that time (
archive). Nijisanji has also begun to privatize the MVs he mixed for them.
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Really fucked up shit if true since he is this well connected and seems like a big name in the idol sphere