Ushio initially dismisses his father’s stories about an ancestor who used the mythical Beast Spear to pin a demon to a temple altar stone as nonsense. However, when Ushio discovers the creature in his own basement, he is compelled to reconsider the family legend. In order to protect his loved ones from the encroaching spirits, Ushio must free Tora from his confinement. Yet, he faces the uncertainty of whether this being will be more dangerous than the curse itself.