Asura is an ancient demonic entity bound within a rare and valuable statue. This statue physically contains the demon's essence, containing its destructive power. The spirit originated as a malevolent being of immense power seeking universal destruction, including blotting out the sun and unleashing chaos. Historical containment efforts sealed it within this statue form.

The statue's theft by the necromancer Tatsuma threatens the demon's release. Tatsuma believes his era fails to recognize his mastery of dark arts; he intends to free Asura to plunge the world into primordial darkness where his necromantic powers would reign supreme. This potential release positions the demon as a catalyst for apocalypse, demanding intervention to prevent catastrophe.

Asura's presence manifests through supernatural phenomena tied to the statue, activated by Tantric Buddhist prayers and chanted invocations. These rituals draw upon esoteric symbolism for containment or release. The entity's ultimate goal remains the obliteration of the current universe, reflecting its inherent nature as annihilation incarnate.

Kujaku, a Tantric Buddhist monk, understands the apocalyptic stakes. He allies with Onimaru—a mercenary warrior versed in forbidden curses—to thwart Tatsuma. Their mission focuses on preventing the statue's physical destruction or ritual activation that would free Asura. Their desperate efforts succeed, preserving the entity's containment and averting catastrophic release.