Promising to grant any wish, the omnipotent Holy Grail sparked three wars in the past, each too brutal and fierce to produce a victor. Despite this, the wealthy Einzbern family is confident that the Fourth Holy Grail War will be different; specifically, because they now possess a vessel for the Holy Grail. For this sole reason, the much-hated "Magus Killer" Kiritsugu Emiya is hired by the Einzberns, with marriage to their only daughter, Irisviel, serving as the binding contract. Kiritsugu now finds himself at the center of a cutthroat survival game, facing off against six other participants, each armed with an ancient familiar and driven by unique desires and ideals. Accompanied by his own familiar, Saber, the notorious mercenary soon identifies his greatest opponent in Kirei Kotomine, a priest who pursues Kiritsugu in search of salvation from the emptiness within himself. Based on the light novel by Gen Urobuchi, Fate/Zero depicts the events of the Fourth Holy Grail War—10 years prior to Fate/stay night. Witness a battle royale in which no one is guaranteed to survive.