According to a 1987 interview with Grand Chamberlain Yoshihiro Tokugawa, who served the emperor for 50 years at the Imperial Palace, Hirohito's affinity for the biological began in the sixth grade ...

Emperor Hirohito appeared to be preparing for war ... At that time, the United States condemned Japan for the 1937-1945 Sino-Japanese War and its Tripartite Military Pact with Germany and Italy ...