I copied and pasted this info, it worked for me.
Either google how to make a Japan PSN account or search the forums.The new PS3 Firmware Update 3.00 was released today, which focuses on navigational features and includes dynamic PS3 theme ability, and if you are trying to save some money and want to get your hands on the first free animated PS3 Theme called Afrika, here is your chance.
The new PS3 Dynamic theme is available as a free download
at the Japanese Playstation Store for account holders. If this has just bummed you out, do not worry, you can view the instruction to open a Japanese account here and be on your way to get Afrika on your Playstation 3.
"how to make a Japan PSN account Video"