Thousands of years ago, an evil space alien calling itself God attacked the people of Sodom by using His Psychic powers to kill and revive em over and over again as punishment for them not letting him use their bodies. The people's hatred for God allowed them to absorb the energy and evolve into Demons. Dante tried to fight God with a jet fighter, but it was caught by a Pteranodon, which was caught by a Dinosaur, which was then zapped by God's energy, which fused em together by Dante's hatred into Mao Dante. He fought against God but had his body sealed in the Himalayas, and his soul sent into the future to be reborn as a human. Years later, Ryo Utsugi was born and had dreams of demons. on a trip, he gets transported to the Himalayas and is willed t destroy the machines holding Dante's body in stasis. Dante's body eats him and regains its soul, then fights the Japanese military like a Kaiju. He also fights Zenon in a napalm fire who tries to make him give up on defeating God. However Ryo isn't aware of the past of Dante at this time. After a conversation about Ryo being Dante and his heart being Dante's heart he attacks Ryo with his 100 demons. He melts his demon warriors on Ryo to trap him in their goo but somehow Ryo wasn't in the demon goo (despite it forming his exact shape) and he rips Zenon in half from behind. As he was dying Zenon told Ryo about how he wanted God to be defeated and to raise a demon army to beat God as well as saying reference about Maoh Satan, Adam and Eve before dying offscreen. Later Ryo learns about his past from Medusa and decides to fight God to win back the Earth. He's last seen on a mountain summoning demons.
The anime goes even further beyond and tells stories after the manga end.
(someone add the rest)
Relationship to DevilmanEdit
After seeing his manga, Toei wanted to do a thing of it but wanted a more human like main character. So he helped make Devilman with Akira Fudo in an Evil vs Evil story.
Also the whole "Human in thr head of a big black demony thing fighting monsters" was used for Mazinger Z
Btw the whole mix of creationism/evolution and God being the bad guy with good gut Demon's has been reused by Go Nagai in many weird crazy sexy ways.