The Graduate School of Frontier Sciences, the University of Tokyo is to operate a Shuttle bus service between the Kashiwanoha campus sta. and the Todai Kashiwa Campus until March 31, 2011. Purchased tickets remain valid after October 1, 2010.
Please look at the site below for more details.
http://www.k.u-tokyo.ac.jp/news/news-image/2010shuttlebus/201004shuttlebus-e.pdf