In the world of 'Fate/Zero', humanity is on the brink of annihilation as a catastrophic event known as the 'Holy Grail War' unfolds. The war is a battle royale among seven mages, each commanding a powerful Servant, a mythical being summoned from various historical and cultural backgrounds. The objective is to claim the Holy Grail, a vessel capable of granting any wish, which will only be awarded to the victor.The series begins with Kiritsugu Emiya, a former mercenary mage, who has lost his family in a tragic event. He seeks the Grail, hoping to revive his loved ones. Meanwhile, Waver Velvet, a young mage, teams up with Rider, a powerful Servant who is
the King of Kings. Their rivalry with Kiritsugu sets the stage for the war.As the story unfolds, more Servants are introduced, each with unique abilities and personalities. Gilgamesh, the King of Kings, is a pompous and arrogant Servant, who believes himself to be the strongest. Saber, a noble and chivalrous Servant, is a skilled warrior. Caster, a mysterious and sinister Servant, possesses dark magic. Assassin, a stealthy and deadly Servant, is a
skilled killer. Berserker, a powerful and ferocious Servant, is driven by his desire for destruction. Lancer, a noble and skilled Servant, is driven by his loyalty to King Arthur.Throughout the series, alliances are formed and broken as the Servants clash in epic battles. The mages must also navigate the complex web of relationships and motivations between their Servants, as well as their own conflicting desires and ambitions. As the war rages on, the characters are forced to confront their own mortality, the true nature of the Grail, and the consequences of their actions.The series culminates in a dramatic showdown between the remaining Servants, with Kiritsugu ultimately emerging victorious. However, the true cost of his victory is revealed, and the series ends on a somber note, setting the stage for the events of 'Fate/stay night'.