Professor Curtis Milhaupt has submitted two fascinating papers to BDTI,oneof which may present guidance for Japan:
The Evolution of Hostile Takeover Reigimes in Developed and Emerging Markets
Economically Benevolent Dictators: Lessons for Developing Economies
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.