This streamer casually bumped into the entire cast of Revue Starlight

Watch the video on YouTube or on alternative frontends [1]

This is from a 2018 stream by JakenbakeLIVE.

The girl who gave the direction is Satou Hinata. She is the voice of:

• Akiyama Mizuki, Project Sekai
• Fukushima Noa, D4DJ
• Hoshimi Junna, Revue Starlight
• Kazuno Leah, Love Live! Sunshine!!
• and maybe other roles I don’t know/care about

She was with the other Revue Starlight actresses at the time, before the anime series was released but after the first stage play was performed.