Same here; I live across the world. Usually, I mean. As a visitor in Japan however, I can confirm that their public transit system is every bit as convenient and efficient as we've been lead to believe internationally. Believe the hype.
I sincerely wish you good luck and hope you can make the trip someday! Visiting Japan has been a life long dream for my wife and I, and we are having an amazing time here. I only wish we could stay.