In this book, Takashi Sekiyama aims to reveal the mechanism of compromise and change in regimes where countries agree in general but disagree on the details regarding coordination methods. When countries agree on the need to collaborate but are in conflict regarding the specific method, one country must always compromise. This situation is known as the Battle of the Sexes in game theory. It has ever been believed that if an agreement is reached under such regimes, the countries do not have the incentive to withdraw from the agreement. This study, however, shows that this belief is not always true if the countries can revise the outcome of their negotiations later. This study also concludes that the factors of “power,” “institutions” and “consensus” determine which country should compromise when the countries agree in general and disagree on coordination methods.