I wish there's an option for "regions" when we register. All my books are from Amazon Japan, yet when I register a new app, the default is Amazon US. Sometimes the app automatically goes to the Japan account, but other times, it doesn't. I already requested Amazon US to delete my account (as others going thru the same problem advised), but it still refuses to go to the Japan site, and I have no idea why. It's quite frustrating. Just letting us manually choose our region in the app would help us and Amazon customer service a lot.