You may want to take a look at this sub's master booklist. Check out this list and this too.

Some others from the "Politics in the East Asia" class syllabus I took:

• Jeff Kingston, Contemporary Japan: History, Politics and Social Change Since the 1980s (Wiley-Blackwell, 2011)
• George Sansom, A History of Japan, 1615-1867 (Stanford University Press, 1963)
• Elise Tipton, Modern Japan: A Social and Political History (Routledge, 2002)