Trying to make Japan more entrepreneurial
13 September 2015 Last updated at 23:26 BST
Since selling his first company to Microsoft at the age of 33, William Saito has been on a mission to make Japan more entrepreneurial.
He says the culture of taboo surrounding business failure, and of respect for elders, means that young Japanese people with new business ideas find it difficult to take a risky step and put their ideas into action.
Video produced by Hoang Nguyen.