It doesn't matter. I feel I should know as much as I can about this place.
[He blinks, eyes slightly wide. He knows exactly when that was.]
I see.
[His chest tightens a little. It's now clear just how risky it may be to give up many details about the "when" he is from. He just exhales silently.]
For me, that was some time ago. [he goes quiet, after, but not for so long where she'd be able to reply again.] I took my memories back from you. It was right as Shouto Isaya was going to turn you back into a human. [. . .] I couldn't let that happen.