Ushio thinks that his father's talk of an ancient ancestor impaling a demon on a temple altar stone with the legendary Beast Spear is nuts, but when he finds the monster in his own basement, Ushio has to take another look at the family legend! To save his friends and family from the invading spirits, Ushio is forced to release Tora from his captivity. But will the creature prove to be worse than the curse?

Ushio thinks his father's tale of an ancient ancestor impaling a demon on a temple altar stone with the legendary Beast Spear is nuts, but when he finds the monster in his own basement, Ushio has to take another look at the family legend! Fortunately, Ushio knows it's best to let sleeping dogs lie and leave captured demons where they are. Unfortunately, the release of the monster's evil energies begins to beckon other demons to Ushio's hometown! To save his friends and family from the invading spirits, Ushio is forced to release Tora from his captivity. But will the cure prove to be worse than the curse? Will Ushio end his life a Tora-snack? Or will the Beast Spear keep Tora in line long enough to save the city?

Ushio encounters a strange purple monster that seems to be helpful, Tora deals with a kitten, and finally there is a mass chase, reprising all of the monsters from the OVA series.

An ordinary boy who wields a magic spear and a demon find themselves reluctant allies against the supernatural threats to the world.