He later commanded a division and a corps in China during Operation Ichi-Go, and died in Shanghai shortly after the war ended.

[1] In May 1919, Banzai worked in the Imperial Japanese Army General Staff Office (German class).

After returning to Japan, he served as an instructor at the Imperial Japanese Army Academy, as well as a member of the General Staff.

[3] He was part of the large Japanese military and naval delegation in Germany since Japan's entry into the Tripartite Pact, and was the chief representative of the Imperial Japanese Army in Berlin, while his naval counterpart was Vice Admiral Naokuni Nomura.

In April 1944, he was promoted to commander of the IJA 20th Army provide a garrison force for areas left under defended by the movement of troops further south in Operation Ichi-Go.

[6] However, the army was not immediately demobilized, but was rearmed by the Kuomintang government of the Republic of China and was assigned to the maintenance of public order until it was officially disbanded on July 15, 1946, at Hengyang, Hunan province.