Speaking as a Tokyoite, you absolutely can but you just won't see them if you're a tourist staying for a week in the most central parts of the city. All in all,

Speaking as a Tokyoite, you absolutely can but you just won't see them if you're a tourist staying for a week in the most central parts of the city. All in all, it's true that there's more variety in US cities - but I guess I don't value variety as much as you do.