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".
The story takes place in Fuyuki City. It is a city surrounded by the sea and mountains. In this common city, a shadow encroaches.
The main character had lost his parents in a fire when he was a child. He was adopted by a person who called himself a wizard. Disobeying his father-in-law, the main character has studied magic. However, because he lacked talent, he could obtain only one magic spell despite several years' training.
One day, the main character is accidently involved in a fight between two opposing masters. As he is dying, a girl suddenly appears and saves him.
"...Now, I ask you. Are you my master?"
He contracts with one of the seven servants, Saber. Willingly or not, he becomes a master, and plunges into a war over the Holy Grail...
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