He has written two books on Japanese politics. One is an empirical case study of Japanese political system, The Logic of Entrepreneurs and the Structure of the System; Organization and Mobilization as seen in the Process of the Taxation System (Tokyo, Bokutaku-sha, 2000). Another is a theoretical study about Masao Maruyama, the most important Japanese political scientist and political theorist after WW II: Friction and Resonance between Two Paradigms of Political Studies: Masao Maruyama and History of Japanese Political Science since 1945 (Tokyo, Keiso-shobo, 2010).