The 1987 OVA doesn't soften what Go Nagai wrote: watching a kid sacrifice his humanity to save it is designed to hurt. The animation moves with weight and consequence in every frame, backed by a score that understands tragedy before the dialogue even tries. This is what the source material was always meant to feel like.
Akira Fudo lives an ordinary life in Tokyo until his childhood friend Ryo arrives with terrifying news: demons are preparing to invade Earth. Humanity has no defense against creatures that exist beyond human comprehension, and only one solution remains possible. To fight demons, they need demon power itself. Ryo convinces Akira to undergo a forbidden ritual that will merge him with a demon, granting superhuman abilities while keeping his human consciousness intact. The gambit works, transforming Akira into Devilman, a being caught between two worlds. He becomes humanity's unexpected champion, wielding demonic strength to protect the people who don't even know why they need saving. But merging with a demon comes with a cost. Akira must constantly battle the monster inside himself, questioning whether he's truly in control or slowly being consumed. As the demon invasion draws closer, he discovers that saving humanity might require sacrificing his own humanity. The line between savior and monster becomes dangerously thin.