Here's a short free ebook that a friend of mine wrote. It's title says it all: "What You Should Know About Japan Before You Go There: A Short Survival Guide"
So if you're going to Japan...
https://www.writers-and-publishers.com/ebooks/
Dubhdara.
Nighthawk,
I've never been - but the friend (American) who wrote it still lives there. I think his contact details are in the download but if not let me know and I'll put you in email contact should you wish.
Best,
Dubhdara.