clipped from: www.japan-cheap-travel.com Foremost among these is the bargain basement Seishun 18 Kippu offering unlimited travel for five days on the slower trains. This is a very cheap ticket, and the five days need not be used consecutively. It is, however, only available at certain times of the year. For more information see our section on this ticket.
Each region in Japan also has it's own version of the Japan rail pass. The Japan-guide website has an exhaustive list of them here.
This pass is available for 5 or 10 consecutive days or for 4 flexible days within one month. The latter option is great if you are planning to spend some time in different locations in between train rides. This version costs 20,000 yen for those older than 26 and 16,000 Yen for people under 26. Further details of this pass can be found on the JR East website.