From my experiences, you should have no trouble going into any parts of Japan... EVERY person I ran across from Osaka, Tokyo, all the way through Yokohama, were the nicest people I have met. Never did I have a wierd feeling about anyone around me (other than the crossdressers in Kabukicho, but thats a story of its own lol). The biggest thing to maybe watch for in Roppongi is the Navy guys Other then that hope you have a good trip, and all goes well..
I can answer a lot of questions you may have just shoot me a msg.
I can answer a lot of questions you may have just shoot me a msg.