I'm not Japanese, but I've studied and worked there for two years, so take what I have to say with a grain of salt. ;)

I dunno if anyone would be necessarily carrying around a katana in modern-day Japan, not without eliciting stares, since it's a weapon, after all (unless they're on a film set in Kyoto, that is!). There's some people who still wear kimono now and then as everyday wear, though, but it wouldn't be everybody. But if they're in an old-timey area, there's kimono rental places where tourists can try them on and walk around. :) (I tried it once--it's a lot of fun!)

I'm impressed by the Japanese you put in here, though--the greetings and the suffixes are pretty much right on! I assume Izumi knows Freya rather well to be addressing her as "-chan," but is she Ayame and Asumi's mother? If she is, she probably would be addressed as "auntie" or "oba-san" instead.

And awww. The friendship between Freya, Ayame and Asumi is really adorable. I like when friendships like that last very long.