Actually, you can I believe. I've brought my prescription stuff in before, but then again, was never checked (knock on wood). The pill is legal now (I don't think it was 3 years ago... if it was, it wasn't very long) so the information you've read has been updated. There is no planned parenthood though... and the medical system is a bit bizarre for a newcomer. Basically, you'll need to go to find an English speaking Gyno (Sanka Fujinka is the word in Japanese) and have him prescribe AND sell it to you (see... different!). Take that with a grain of salt, as I'm a man, and haven't experienced it, but a few of my gal friends have. All of which used to bring months worth in from abroad when it was illegal mind you. As long as it's not mind altering Class-A stuff, they usually just tell you no and throw it out.
HTH
GP