In the spring of 1946, judges from eleven victorious countries gathered at the Imperial Hotel in Tokyo when the Tokyo trial was held to convict Japanese war criminals. The focus of the trial is the "war crimes" that were born with the Nuremberg trial. Prior to this, the act of "war", which was considered legitimate in International Law, was recognized as a criminal act for the first time, and the national mentor was held accountable. As for the statement of "war crimes", the defence regarded it as an ex post facto law and did not recognize it. In court, the opinions of the judges are also opposing. At first, the trial, which was intended to be resolved in a short period of time, appeared to be long-term and chaotic. In the attack and defense behind the court, the private activities of the judges stationed in Japan and the opinions of the people around them were involved. In the autumn of 1948, after two and a half years of trial, eleven justices finally reached a verdict. At the moment of determining the life and death of the defendant, the most fundamental question of human beings, "whether human beings can adjudicate war", has also come to a final answer.