Amanojaku, a demon-human hybrid from the man-beast realm, is exiled with a mandate to locate the Chōjin—a prophesied entity fated to unite or annihilate the realms. The manga portrays him as a sociopathic trickster who deceives women into sexual encounters, devoid of empathy or noble purpose, culminating in his ambush and death following the Chōjin’s cataclysmic rise.

Anime adaptations reimagine him as an anti-hero convinced the Chōjin preserves cosmic balance. Though morally ambiguous, this version shields allies and confronts existential threats, growing increasingly cynical across sequels yet steadfast in his mission.

In *The Urotsuki* (2002), Amanojaku avoids execution in the man-beast realm by investigating the Chōjin’s legacy in the demon realm. An accidental realm merger thrusts him into battling escaped demons in the human world. Spanning 300 years, the narrative explores his immortal struggle against apocalyptic chaos, his supernatural combat prowess, and a climactic clash with the Ultra God—a destructive force linked to the prophecy.

Key dynamics include a rivalry with Suikakujū, a demon opposing the Chōjin, and shifting allegiances with his sister Megumi. Interactions with humans Tatsuo Nagumo (the Chōjin’s host) and Akemi Itō trace his evolution from detachment to reluctant guardianship.

Consistent across media, his appearance blends humanoid and bestial traits, enhanced by supernatural energy and combat agility. The anime expands his lore with ritual-induced visions and a susceptibility to the Chōjin’s transformative influence.