A nerdy young college instructor named Shinji Kikyo returns home one day to find himself the target of a mad assassin. Surviving somewhat miraculously, he fends off other assassins and with the help of reporter Keiko Tsurumaki and car mechanic Bill Otomo, eventually discovering that a "population control" association is really an assassination squad led by Shogo Mizorogi, who has been training patients of a mental asylum to become killers.

Charged with insubordination for punching a superior, Sergeant Kosugi is shipped to China in the last desperate days of the Second World War. His commander, Captain Sakuma, is vicious and dictatorial. Sakuma places Kosugi in charge of training for combat what once was the military band. Kosugi must somehow prepare his inept soldiers for the rigors of combat.

1968 film by Kihachi Okamoto

1964 film by Kihachi Okamoto

1966 film by Kihachi Okamoto