But if you managing your schedule by iPhone, or some other smartphone regrettably it won't work... It's easy and manageable but...
Handwriting your appointment book will also become awesome history of your own!
Don't be managed by digital gadgets! Your life will look so boring.
Here below you can buy through Rakuten Global directly from Japan. Enjoy!
http://domoarigatojapan.weebly.com/blog/how-to-use-rakuten-global-service
But maybe not needed because it's easy to do.