Would You Like Even the Devil

The world has quietly changed for some unknown reason;
Mai Sakurajima, Shokuhou Misaki, and Misaka Mikoto suddenly appeared.
Why can I still connect to another world?
Holy Grail War; Apocalypse Virus;
The labyrinth city of Orari; the emperor's ambassador;
"The world is so chaotic, since I have become a demon, I should be insidious, cunning, cruel and tyrannical, as it should be..."
But these girls are not only not afraid of themselves, but look happy when they see them;
The devil can't help but ponder...