is a Japanese manga series written and illustrated by Go Nagai which originally started as an anime adaptation of the concept of Nagai's previous manga series, Demon Lord Dante. A 39 episode anime series was developed by Toei in 1972 and Nagai began Devilman as a manga in Kodansha's Shōnen Magazine, barely a month before the anime series started. The series has since spawned numerous OVA, manga, novels, and films.
Devilman and other characters from the series have shown up in cameo appearances numerous times in Go Nagai's other works. The most notable is Tomoharu Katsumata's 1973 feature film Mazinger Z Vs. Devilman, which features Devilman teaming up with Nagai's titular robot to fight Dr. Hell.
Devilman is about a teenager named Akira Fudo. At first, Akira is very modest and gentle, avoiding conflict. When his parents are lost on a business trip in the Arctic, Akira goes to stay with his childhood friend Miki Makimura and her family (mother, father, and bratty kid brother Tare). Both soon form a close relationship. Miki, a tough, smart, self-sufficient girl, loves Akira but wishes that he would stand up for himself when he gets pushed around, and is frustrated by his lack of backbone. She often has to defend herself from bullies even when Akira is with her. In the first OVA, she saves Akira from a gang of bullies who are threatening him.
One day, Akira's best friend, Ryo Asuka, asks a favor and completely changes Akira's life. Ryo's father had discovered the existence of demon when he found a mask during an excavation of the ruins of an ancient Mayan temple. This mask turns out to be a fossilized demon skull, which shows whomever wore it what the world was like when demons ruled over it. Ryo shows Akira this and informs him about the demons' revival. Akira then sees Ryo's plan: "To fight a demon, one must become a demon."
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Official Site: Toei Animation
Links: Devilman Wiki entry Cjas.org Devilman page Intern. Hero Devilman page