The Japan Secret Defense Organization, or J for short, protects Japan from any big threats - that's what they do! The organization is headed by a man called "Colonel" and has three "JAs" under him. They are the best secret detectives in the J agency. The case takes place in Hong Kong, a cosmopolitan city with a network of spies from many countries and a smuggling ring in the dark: S3 of the J Agency has been killed by a spy from a hostile I country, and S6, who was supposed to meet him, decides to look for the only clue: a boy named Jiro Asuka! Popular Weekly Shonen King serial of Mochizuki's and considered to be his masterpiece alongside Wild 7, which was serialized after. In Japan, JA is said to have parallels with the "007" series.