"Flash Player 9" Japanese version is available for download

The previous version is 8.5. The new version announced today is said to be 10 times faster. Download and install from the following site.
Macromedia - Flash Player Download Center
http://www.adobe.com/jp/products/flashplayer/

See below for a detailed release on where and how it changed.

Adobe - Adobe Press Room: For immediate release

Furthermore, if installation fails, there is a need to uninstall the Flash Player itself and reinstall it. Click here for uninstaller.

Adobe - Adobe Web Players

You can also manually uninstall it.

[228692] How to uninstall Macromedia Flash Player plug-in and ActiveX control manually

If you say that Flash can not reproduce for some reason or if the version is strange, it will generally cure when you uninstall and reinstall it.