Motoyobu Miyazaki is refusing to testify as an unsworn witness in a corporation scandal. Miyazaki is a former executive in Yamada Corp, which is under investigation for collusion. He was summoned recently and has refused to be involved. One can imagine that Miyazaki has something to do with the case that may not be good for his reputation. The case isn't against Miyazaki though, it is aimed at scandals that may invovle the top defense beaurocrat and the defense trader.