While pursuing a vicious pistol-wielding robber, Detective Hachiro Azuma, a skilled detective with the Tokyo Metropolitan Police Department's First Investigative Division, falls into an enemy trap and suffers mortal injuries. He is treated by the mysterious scientist Dr. Tani and awakens once again. However, his body is no longer usable, and he is reborn as a robot, replicating his memories and personality from his previous life. He is reborn as "Eight Man," a super robot equipped with a miniature nuclear reactor hidden in his chest and possessing numerous supernatural powers.

Gold thefts are occurring frequently. The only clue is the constant "whoosh, whoosh, whoosh" sound heard at the crime scenes. While the police are puzzling over the Golden Gang, a young girl visits the Azuma Detective Agency. What is the true nature of the mysterious noises coming from the Golden Gang's hideout?

A world-renowned international gang has reportedly infiltrated Japan. One day, while Eight Man was staking out its base, Dr. Mizusawa arrived, questioning Kito, the boss of the gang's foreign unit. What is her goal, claiming to have perfected a laser ray gun?