We have been given details from a specialist recruitment agency about IT opportunities in Japan. Details of the jobs and the application process can be found on their website at the following links (one for each company):
http://business-paradigm.co.jp/recruit/rakuten.html
http://business-paradigm.co.jp/recruit/wap.html
http://business-paradigm.co.jp/recruit/dena.html
These are open to recent graduates and those graduating next summer.