Summer 1973

After Mazinger Z defeats another assault by Dr. Hell's Mechanical Beasts, the battle awakens demons that have been sealed beneath the earth. Dr. Hell sees an opportunity and joins forces with the Demon Tribe, offering a common goal: destroy Mazinger Z and eliminate Devilman, the demon who turned against his own kind to protect humanity.Kouji and Devilman begin as proud rivals, but neither can stop the alliance alone. With aerial demons exploiting Mazinger Z's inability to fly, the Photon Power Laboratory races to complete the Jet Scrander while the two heroes learn that defeating a shared enemy may require them to fight side by side.