[Alternate planes, training, the Seventeenth? Where should he even begin?

Names. Names were a good starting point!]

Hi, Nagi. My name is Hibiki Kuze, and I'm really confused. I don't want to overwhelm either of us, though, so I'm making some assumptions and running with them for now.

Are you saying you're from an alternate plane of reality, or a— [Not regressed. Probably not regressed.] —a different version of the world where most people can't see demons running around?