The 1990s is perceived in Japan as a lost decade, but it also was a decade of profound political, economic and institutional transformation. Books and articles reviewed here analyze this unprecedented change from diverse angles. Authors are in agreement that Japanese political economy has undergone major transformation in the 1990s. However, over the issue of how much and in what area those changes have occurred, authors take different standpoints. Also as to what would be the shape of future political setup, they provide us with divergent scenarios.