Young male Akira Fudo and his father Reijiro Fudo are killed on a scientific expedition of the Himilayas and the demon Devilman takes over his body. Using Akira's form as a disguise, Devilman is sent to cause trouble on earth in order to pave the way for the demonic invasion. However, Devilman falls in love with Miki Makimura and her tough, no nonsense ways, and is distracted from his demon duties. The other demons attempt to kill Miki but Devilman kills them to protect her.