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It is said that the Holy Grail grants wishes to he who wields it. To materialise the Holy Grail, a ritual is about to be held. The Holy Grail will choose seven wizards (masters) and give them seven familiar spirits (servants).

Saber, Lancer, Archer, Rider, Caster, Assassin, and Berserker.

The master contracts with one of seven familiar spirits that plays one of the above roles (classes). The master must prove that he is qualified to have the Holy Grail, meaning that he must eliminate other masters to show he is the strongest. This ritual is called "The Holy Grail War".