I forgot... only a little late... The video was on Yunagi's channel and it's a music video. A cover MV of Kaf's song 海に化ける. It's an interesting choice and once you listen to it, you'll see why she chose to sing this song. I was surprised her voice could sound like this after her showing at KamiFes 24. I'm excited to hear more from her and see what her range really is. Will they rotate cover releases per week between the members? Waiting 5 weeks to hear her next cover is kind of long...
https://www.youtube.com/watch?v=KLr1wbjBz3wI'm not sure if this is a hint at streams or if she's going to play with the other members of Girls Revolution Project on their own time. She's talking about a horror game and those are predominately streamer games, so I can only imagine it could be streamed. If Yunagi is referring to horror games to play together then it's just in her tastes?
https://twitter.com/yunagi_gr/status/1822547497614528994 