In a Japanese city plagued by supernatural entities, a secret war unfolds between the demon Eko and the spectral warrior Karas. Eko has transformed himself and his followers into mechanized beings to fight against the Karas's unearthly powers, which can take the form of various armored vehicles. The Karas's human form is contrasted with Eko's followers, who must feed on human fluids to survive, leading to periodic massacres with only a single traumatized survivor remaining.

Karas: The Prophecy
In a city plagued by supernatural forces, a hidden conflict erupts between Eko, a demon fueled by technology, and Karas, a spectral warrior, as they engage in a battle for supremacy.