"Urotsukidōji III: Return of the Overfiend" is the third installment in the "Urotsukidōji" series, continuing the dark and fantastical narrative centered on the struggle between humans, demons, and supernatural entities. The story unfolds in a world where the boundaries between dimensions are breaking down, leading to chaos and conflict. The Overfiend, a powerful and destructive being prophesied to unite the realms of humans, man-beasts, and demons, remains a central figure in the narrative. However, the Overfiend's role is ambiguous, as its emergence brings both destruction and the potential for a new order.

The plot revolves around the aftermath of the Overfiend's rise, with humanity and other factions grappling with the consequences. The human world is in disarray, with survivors attempting to rebuild while facing threats from demonic forces. Key characters include Amano Jyaku, a human who becomes entangled in the supernatural conflict, and Nagumo, a demon hunter determined to protect humanity. The narrative explores themes of power, survival, and the blurred lines between good and evil, as characters navigate a world where alliances are fragile and motivations are often self-serving.

The series delves into the relationships between humans and demons, highlighting the tension and mistrust that define their interactions. The Overfiend's influence looms large, with various factions seeking to control or destroy it. The story also introduces new characters and expands on the lore of the series, providing deeper insight into the origins and nature of the Overfiend. The narrative is marked by intense action sequences, supernatural battles, and a sense of impending doom as the characters confront the challenges posed by the collapsing dimensions.

"Urotsukidōji III: Return of the Overfiend" maintains the series' signature blend of horror, fantasy, and philosophical undertones, presenting a complex and often grim portrayal of a world on the brink of annihilation. The story advances the overarching plot of the series while exploring the personal struggles and moral dilemmas faced by its characters. The series continues to build on the established mythology, offering a compelling continuation of the "Urotsukidōji" saga.