Well, for the first two, there's not much that can be done outside of moving to a less densely-populated area, which I'm guessing that it's going to be at a premium over in Japan with the lack of land it has.
The mannerisms aren't that much of a big deal if you don't get into them yourself (I consider myself to be a proper gentleman, which is rare today.) As for the crime, well it just goes to show you that it's everywhere civilization is. Sad truth, really.