I am not in Japan but have stayed there long enough to be considered to have lived there as in more than one month at a time
I stayed walking distance to Musashi-Koyama and I proudly possess a Library Card for that area
Tokyo is definitely cool as a tourist and I completely understand the infatuation but fortunately the GF has cured me of any such innocent infatuation and now I am able to experience the same imperfections in Japan and the Japanese as any other place.
Favorite thing about Japan is probably the SUPER IMPRESSIVE RAIL SYSTEM!
speaking of the LIbrary, two elderly pensioners got into a Rough-&-Tumble right next to me as I was browsing the books. I observed some CURmudgeonry Irritation between them, one called the other "Stupid" at which point I knew it was on....and next thing I know one does a Perfect Judo throw to the other straight into knee on belly.....I quickly used the Gracie Basics method to wrap him up as I could see he was clearly with the capability to hurt the other fellow who did not appear so well versed in violence.....
.....and when I wrapped my arms around that Elderly fellow he FELT LIKE IRON at which point I felt a panicked anxiety thinking what did I get myself into and worried he was going to Judo throw me next! But he hesitated...and it gave me and him both time to quickly excuse ourselves while the Librarian lady attempted to keep things from becoming a public embarrassment and which was my other thought for hugging that man to try and prevent him from getting himself into any legal headaches over a momentary condition of CURMUDGEONRY