This article argues that in contrast to the USA, United Kingdom, and Australia, the impact of 9/11 on Japanese executive power largely has been restricted to the realm of Japan's foreign policy and relations, with comparatively little effect on domestic policy. Indeed, the 9/11 attacks and ensuing War on Terror served mostly to augment an already existing trend in Japan towards constitutional reform and away from the duopoly on political power and policy traditionally shared between the Japanese bureaucracy and the Liberal Democratic Party factions.