Post war Japan is at its lowest point when a new crisis emerges in the form of a giant monster, baptized in the horrific power of the atomic bomb.

A widower from Japan travels with his estranged son to England in order to fulfill his late wife's dying wish.

A deadly and mysterious master of the occult travels across feudal Japan, seeking malevolent spirits called Mononoke to slay. He must uncover their Form, Truth, and Reason to wield the mighty Exorcism Sword against them.