Amano Jyaku is a demon-human hybrid from the man-beast realm, banished to Earth for misconduct involving the Great Elder and his daughter Mimi. Tasked by the Great Elder to find the Chōjin—a prophesied unifier of worlds—the manga depicts Jyaku using deception, seducing women under the false pretense that his sperm repels demons. Anime adaptations present a different Jyaku, driven by a 300-year quest to identify the Chōjin's human vessel, believing it will unite the human, demon, and man-beast realms. This version highlights his dedication to the prophecy, though his convictions are repeatedly challenged. His sister Megumi Amano's portrayal varies: the manga shows her as a manipulative rival to Akemi, while the anime softens her into a more empathetic figure with romantic feelings for Takeaki Kiryū. In *Legend of the Demon Womb*, Jyaku opposes Faust Münchhausen II, a Nazi descendant attempting to resurrect the ancient Kyō-Ō using Takeaki Kiryū as a host. Protecting both the human world and his sister, who genuinely cares for Kiryū, Jyaku is drawn into conflict. Manipulated into killing Kiryū to stop the Kyō-Ō's awakening, Megumi then battles Jyaku in a tragic confrontation atop Shinjuku skyscrapers. Jyaku's loyalty to the Great Elder persists in the anime, where the Elder aids his understanding of the Chōjin. His history with the demon Kohōki—Megumi's former lover, banished for their affair—adds complexity, especially when Kohōki serves Münchhausen before sacrificing himself for Megumi. Across all narratives, Jyaku acts as a bridge between realms, navigating prophecies, betrayals, and apocalyptic threats while balancing his hybrid nature and shifting loyalties.