in , () construction investigator Quyen was assassinated and Akimoto, a Japanese trading company employee who was in contact with the government official, disappeared. Secret agent Jiro Kitami was dispatched to from the International Secret Police (I.S.P.) Headquarters in , alleging that a named Rudolf Kent was involved in the incident. Akimoto was kidnapped at the during his return from Vietnam with a , contain a secret conversation between the smugglers and NVA officers (). Kitami, along with Akimoto's colleague and security agent Natsuo Ezaki, must stop the Kent Gang, a smuggling ring, from shipping weapons to .