It's the Dimension Chat Group

"Where there is a strong enough will among living beings, attention may be cast, and commissions may be issued."

Bronya (Big Duck Bronya): *"Not just that~ You can also create games and films to broadcast across worlds. I made Honkai Impact 3rd to give the 'me' in that Honkai-corrupted world a little... enlightenment. And to earn some points on the side... Ugh, I really want a Project Bunny 19C too. So jealous. ...Wait, no, I shouldn’t be. After all, my world doesn’t have Honkai."*

Tokisaki Kurumi: "You can also use simulators to authentically recreate scenarios and find the Origin Spirit’s weaknesses~"

Akemi Homura: "Personally, I prefer the 'Abyss' training method. I’ve reached 'Agony' difficulty so far. Once I hit 'Crimson Lotus,' I should be able to defeat Walpurgisnacht... and save Madoka."

"So... you’re telling me this is just a 'chat group'?"

"Mhm~ It’s a Multidimensional Chat Group, you see?"