[Sute443]

Originally Posted by Kaisos Erranon

Because she does stay behind? Pretty sure Kyon and Mikuru don't go back with her.

Need to reread Vol. 7...

Spoiler for Space:

When I open my eyes, I'm standing in Nagato's living room with Asahina-san on my back.

Nagato is standing facing me.

"Sixty-two seconds have passed since we departed."

Lifting her head to look at me, she said,

"We're back."

Back to our own time and world.

I don't think it would have been phrased that way if Nagato had stayed behind.