Or should I say dealing with Japanese money as a foreigner?

Anyway, to survive in Japan you're going to need Japanese money, or yen.

Where I come from in America you don't need cash money to go out and buy stuff, a credit or debit card will do; but Japan still by and large uses a cash-based system.

Most restaurants still accept only cash, and even some electronic stores will only take cash payment (a real pain when you're buying something expensive).

If you can find any men's relaxation places that accept credit, jump at it, because those are few and far between.
There are multiples way that a visitor to Japan can get yen when in the country.

The most obvious is to bring over a bunch of money from your country and then exchange it at the airport and get yen.

That's OK, but not great. It's a bit of a pain to walk around with that much yen on you at one time. Plus, what if you lose it?

Most major banks in Japan will exchange certain foreign currencies for yen, but you need to go to the major location branches for them to do so.

If you're in a smaller city, you may be out of luck.
I think your best bet will to bring your cash card with you when you come. That will give you access to the places that do accept credit; plus you can use it at certain ATMs to get yen!

Now, don't go getting all excited, there are only 2 places that will 100% accept foreign cash cards in Japan. Let's learn about them now!
The first place is at the post office in Japan, knows as JAPAN POST BANK.

They're the most flexible for withdrawals because they'll let you take as little as 1,000 yen out at a time, and as much as 50,000 yen per day.

You can find Japan Post Bank ATMs in all Japanese post offices and even standalone kiosks in some malls.
The second is SEVEN BANK which is a part of Seven Eleven convenience stores in Japan. These are everywhere, in the convenience stores themselves and in malls and other handy locations.

The good thing about "Seven Ginko" as they're called in Japan, is that they're extremely flexible in what cards they accept, and they have many,
many languages to choose from when you put your card in, so even if you don't speak Japanese or English, you're probably covered.

They've also upped the daily maximum withdrawal amount to 100,000 yen ($1000) recently, up from 50,000; BUT you'll need to make sure that your bank will let you take out that much at one time.
If back home you have a daily withdrawal limit, you'll have that same limit in Japan.

Now, the bad thing about the 7-11 ATMs is that the minimum you can withdrawal at one time is 10,000 ($100), so if you need less, or don't have that much in your account, you'll need to go elsewhere.
Getting cash in Japan can be simple and easy. Just follow this advice and you'll be on your way to play!