How does Japanese general public react to the recent drastic changes in its national security environments? Our team has been working on variety of online survey experiments in Japan on its nuclear “possession” taboo, a possible military escalation over the territorial dispute with China — the rising superpower, and “invisible” crises in a distant, isolated open sea/air like one happened between South Korean naval vessel and Japanese Maritime SDF’s P-1 patrol aircraft in December 2018. Our data provides valuable information on how the general public in the East Asian democracy would evaluate the changes in its national security environment and what kinds of policy reactions of the government would be preferred. We find that nuclear possession taboo is still strong but could be manipulated, power transition perception significantly hardens attitudes toward the rising power and an invisible crisis may turn into a visible crisis due to the prisoner’s dilemma type of mechanism of denouncement message.