No, it's not. It's a Nico Nico Chorus of Only My Railgun, which means all of the people there are fandubbers using the characters as an avatar of sorts.
Also, I just heard Kirino call Accelerator seriously cool. And hearing Accel say "my little sister can't be this cute" is weird.
I can't tell who Kuroneko's quoting, but it sounds like someone on the magic side. I think it mentions the Book of the Law, an enemy of the Daihasei, and "I wonder if my power's really needed?"