Is a Discover Credit Card able to be used?

Do I need to use Visa instead or will the a Discover CC be widely accepted in Kyoto and Tokyo? Thanks!

Discover card is widely accept in Japan. The Discover card placard won't be displayed, but it can be used anywhere that accepts JCB.

An added benefit of using Discover is that, as I understand it, they don't charge a foreign transaction fee that typically comes to 3% when you use a Visa card. (If this matters to you you should verify the information, but I'm pretty sure it's accurate.)

Fantastic, thank you!!!

Yes, that is correct, no currency conversion fee.....thanks!

I heard somewhere (I think on another forum) that some merchants might not realize that they take Discover, even though they do take JCB. JCB is very well established in Japan, but the tie-up with Discover is relatively new. If a place that displays a JCB logo tells you that they don't take Discover, chances are they are mistaken. If you can persuade them to at least try, the charge will likely go through.