I'd sort of question how unknown Ki is in Ranma's world, considering there seem to be all kinds of bullshit martial arts from all over that really don't look natural. It's also a world where you can buy genuine Magical Artifacts from traveling salesmen and no one thinks that's weird, order Iron Man-style power armor out of the back of a comic book, and the Shishi Hōkōdan was originally used as a mining technique.It took every ounce of your control to not flip the fuck out at what Ranma was telling you; a world that almost didn't know about aura?
Based on all that, Nerima is probably only slightly strange by that world's standards.
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