"Underwhere, Underworld? Yeah, I'm going to guess that it's similar or at least as much as your world is similar?" There were definitely similarities. "You kind of look like how humans think Kappa look, by the way. Only a lot bigger."

His question had her tap her lips. "So, they're words humans use. We picked them up and ran with them because they're handy. Demons, Oni, are a specific sort of thing. Big, powerful, tempermental. Usually drunk all the time to keep their rage in check. Most of them are pretty minor, but there's some big muckity mucks that usually add titles."

"Youkai's just sort of a catch all for spirits and monsters that humans don't understand. Thousands of different kinds. All different, all weird. Usually one comes into existence because something got regretted, and there's a wrong to redress. And when it's done, they sort of ... stuck around." It was a bit of an oversimplification, but a lot of youkai were like that. Revenants who lingered because something got screwed up and needed to be fixed, and afterwards pandora's box was already opened and they were there.

"I'm what's called a Hashihime, a bridge princess. Kinda a vengeful spirit but I took care of that a long... long time ago." Snort.