do you know Fruits? its a Japanese street culture magazine with a really distinctive photo style and you just nailed it. check it out on the net. The kids there love it, I reckon they must be pretty open to street portraits. I am super jealous that you are there. There's some frikin beautiful film and camera shops over there.
Cute girls, and always with the V sign. We saw very few women in kimono when we were there. Probably not more tha 20 in our two week visit, Good catch.
http://www.google.com/search?q=fruits+japan+magazine&hl=en&rls=com.microsoft:da:IE-Address&tbm=isch&tbo=u&source=univ&sa=X&ei=fy1EUaiZK47LrQegqYGoDw&ved=0CDoQsAQ&biw=1366&bih=622