Think it's more of the former. Similar place and culture, but they didn't have Empyreans or other things from ours, and same for her world.

[He's pretty much done, so all that's left is the beer.]

Still,it's pretty cool. Actually I should try and see if it's true for Kotori, too... She's not a fighter so I didn't think about it, but, hmm.

[Yes. The only reason why he bothered to learn about Musashi was because she was a fellow swordsman. This guy and his dumb priorities.]