After being murdered by criminals, Detective Yokoda's body is recovered by Professor Tani and brought to his laboratory. There, Tani conducts an experiment that has previously failed seven times; Yokoda is the latest subject for the transfer of his life force into an android body. For the first time, the experiment succeeds. Yokoda is reborn as the armor-skinned android 8 Man, capable of dashing at impossible speeds and shape-shifting into other people. He shifts himself into Yokoda, this time christening himself as "Hachiro Azuma". He keeps this identity a secret, known only to Tani and his police boss Chief Tanaka. Even his girlfriend Sachiko and friend Ichiro do not know he is an android. As 8-Man, Hachiro fights crime (even bringing his murderers to justice).