1. Introduction: A Study of Prime Ministers in Postwar Japan.- 2. Kantaro Suzuki: The Premier Who Ended the War.- 3. Naruhiko Higashikuni: The Imperial Leader Who Disbanded the Armed Forces.- 4. Kijuro Shidehara: An Internationalist Who Embraced the Peace Clause.- 5. Shigeru Yoshida (I): The Antiwar Pacifist as a Diplomat and Leader.- 6. Tetsu Katayama: The Christian Pacifist and First Socialist Premier.- 7. Hitoshi Ashida: The Diplomat, Journalist, and Advocate for International Peace.- 8. Shigeru Yoshida (II): The Peace Treaty, the Alliance, and the Self-Defense Forces.- 9. Ichiro Hatoyama: The First LDP Premier to Normalize Relations with Moscow.- 10. Tanzan Ishibashi: The Antiwar Journalist, Statesman, and Peace Philosopher.- 11. Nobusuke Kishi: The Nationalist Premier Who Revised the Security Treaty.- 12. Hayato Ikeda: The Income Doubling Plan and Peace through Prosperity Initiative.- 13. Eisaku Sato: Non-Nuclear Policy,Nuclear-Free Okinawa, and the Peace Prize.- 14. Kakuei Tanaka: Remodeling Japan and Normalizing Relations with China.- 15. Takeo Miki: The Antiwar Pacifist and Advocate for Clean Politics.- 16. Takeo Fukuda: The Fukuda Doctrine and All-Directional Peace Diplomacy.- 17. Masayoshi Ohira: The Architect of the Pacific Basin Cooperation Concept.- 18. Zenko Suzuki: The Dovish Premier in Pursuit of the Politics of Harmony.- 19. Yasuhiro Nakasone: The Nationalist Leader in Search of Autonomy and True Alliance.- 20. Noboru Takeshita: The Advocate for International Cooperation for World Peace.- 21. Sosuke Uno: Scandals and Summit Diplomacy.- 22. Toshiki Kaifu: The Gulf Crisis, UN Peace Cooperation Bill, and the Gulf War.- 23. Kiichi Miyazawa: UNPKO and the Dispatch of Self-Defense Forces.- 24. Morihiro Hosokawa: The First Non-LDP/Non-Communist Coalition Government.-25. Tsutomu Hata: The Shortest-Serving Premier under the Postwar Constitution.- 26. Tomiichi Murayama: Official Apology for Japan’s Colonial Rule and Aggression.- 27. Ryutaro Hashimoto: The Japan-US Joint Declaration and Defense Guidelines.- 28. Keizo Obuchi: The Visionary and Initiator of Japan’s Human Security Diplomacy.- 29. Yoshiro Mori: The Kyushu-Okinawa Summit to the Olympic Truce Resolution.- 30. Junichiro Koizumi: From Kantei Diplomacy to Anti-Nuclear Diplomacy.- 31. Shinzo Abe (I): ‘Toward a Beautiful Country’ and Constitutional Revision.- 32. Yasuo Fukuda: Struggles for International Contribution in the Twisted Diet.- 33. Taro Aso: Value-Oriented Diplomacy and the Arc of Freedom and Prosperity.- 34. Yukio Hatoyama: First DPJ Premier and the Vision for the East Asian Community.- 35. Naoto Kan: The Great East Japan Earthquake and the Nuclear Disaster.- 36. Yoshihiko Noda: Decision on Atomic Energy and SDF Dispatch to South Sudan.- 37. Shinzo Abe (II): Abenomics and Proactive Contribution to Peace.- 38. Yoshihide Suga: Toward a Carbon-Neutral Society during the Pandemic.- 39. Conclusion: Japanese Prime Ministers in the Changing International System.