Paper Money or YEN in Japan is very popular. I say this as it will become very apparent to you after you have been in Japan for more than a few hours. Everything is done with paper money. This will shock you at first as you did not expect this in Japan of all places. The technology country it is and YEN is still king. The Japanese do not use Credit Cards like we do…they use YEN. So get used to using it and make sure you have a plan for the change. You will need a place to keep it so that it’s not a mess. A small pocket or dedicated pouch will make you feel more prepared.