"Wow," Kaya said, smiling. "Maybe I really should start reading up on alchemy. I won't learn it, I guess, but it would be nice to start to understand how it comes about in the first place."

Hmm. That sounded a lot like magic: and once she saw the person she changed into, Kaya started.

"Wait, that's A...Asuna! Negi's partner! Are you from Negi's world?" Pause. "Wait, are you telling me that you change into her and have all of her thoughts and feelings? then.. how would we know that you weren't impersonating Asuna to begin with?"