Soon Japan will have its first stewardship code. You can download a translation of the exposure draft of the stewardship code here:
http://bdti.mastertree.jp/f/yj8ez02t
At the same time, Matthew Orsagh of the CFA Institute has written this useful summary of recent development related to stewardship and engagement around the world:
http://blogs.cfainstitute.org/marketintegrity/2014/03/26/shareholder-engagement-bridging-the-divide-between-boards-and-investors/
The Board Director Training Institute (BDTI) is a "public interest" nonprofit in Japan dedicated to training about directorship, corporate governance, and related management techniques. It is certified by the Japanese government to conduct these activities as a regulated nonprofit. Read a summary about BDTI here, and see a menu of its services for both corporations and investors here.