[ this is where she hesitates. she hadn't really gone into the specifics of her origins outside of people who she was already directly involved with as a result of her mission. it isn't like kei isn't already technically a part of that group just by virtue of being everything he is: nanjo, persona user... and he'd been forthcoming with her...

so finally, she nods. ]

That is correct... As you have most likely assumed, I am not human. I was created mainly as a unit specializing in combat against Shadows.

[ ... and because she feels it needs to be said, given his prior statement, and just... because: ]

I am sorry I could not accomplish my mission soon enough to lessen Mitsuru-san's burden.