Akira Fudou crashes a demon-infested nightclub party with Ryo Asuka, and the demon Amon takes him over, only for Akira's own humanity to win out and leave him with Amon's powers and a resolve to protect people from the Demon Tribe. This 1987 OVA retells Devilman's origin in closer step with Go Nagai's manga than the 1970s TV series did, ending on the newborn Devilman's slaughter of the demons still in that room.