Satan weeps over killing the one mortal being who made them love again as God's angels descend to Earth and wipe out the planet once more. At the end of their monologue, they look over and see that Akira is dead. However, Satan tells Akira they regret their actions, since destroying 'weak' humans is the equivalent of God exterminating 'weak' demons - they have become just as cold as their Father. When demons are revived and find that humans have taken over, Satan resolves to wipe out humanity and reclaim Earth for its original inhabitants. Satan was wounded in the battle and sealed with the demons in an icy prison for millions of years. In the end, with the world destroyed around them, Satan tells Akira that they originally opposed God because of his cruelty toward the demons, whom Satan had grown to love. After society is undermined by paranoia and fear - and Miki is murdered as a result of the human's hatred for demons - Akira and Satan have a 20 year war. Ryo goes on live television and runs a tape of Akira becoming Devilman. (It is even implied that his memories of his relationship with Akira may have been falsified.) Yet Ryo's feelings of friendship for Akira develop into love, even when he uncovers his true identity. To infiltrate and destroy the human world, Satan was hypnotized by Psycho Jenny and lived as the former Ryo Asuka. Later, when demons attack and possess a lot of people, Ryo realizes that the real Ryo Asuka has been dead for some time and that he is actually Satan. The two go to the Sabbath, a drug- and sex-fueled party, where almost everyone gets possessed after Ryo slashes a woman with a broken Kaim, Ryo heals Akira and reattaches Akira's severed arm, hinting that he has strange powers. Both Akira and Ryo cry together in fear, but they clasp hands and swear to protect mankind. Ryo explains that only a pure hearted person has a chance of resisting a demon's will and taking advantage of their powers if the demon takes over their psyche, they must commit suicide. After demons ambush his house, Ryo tells Akira that the only way to beat the demons is to merge with one. He takes Akira to his place and makes him wear the demon fossil that his father uncovered, which reveals what the world was like back when demons ruled.

Ryo saves Akira and Miki Makimura from a gang of bullies by pulling a gun on them. His father committed suicide after becoming possessed by a demon and left Ryo with a terrible legacy. Ryo is a good friend from Akira Fudo's past.

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