The story is mainly about how Shiro­ Emiya, an amateur mechanic who attends school at Homurabara Gakuen in Fuyuki City is thrown into the Holy Grail war.

This war has lasted two centuries and each time seven sorcerers assemble and engage in a Battle Royale, each gambling his or her own life to obtain the Holy Grail, a legendary chalice capable of granting wishes. The past four Holy Grail Wars have typically occurred every sixty years, with the most recent concluding a decade ago, but the fifth war has eerily started prematurely.

These sorcerers, better known as Masters, are aided by spiritual familiars known as Servants, who are the reincarnations of legendary souls from all across time. These resurrected Epic Spirits, possess superhuman characteristics and wield powerful artifacts or abilities called Noble Phantasms. A Noble Phantasm's hidden abilities may be released by invoking its true name, but casual brandishing of a Noble Phantasm is best avoided, for symbolic Noble Phantasms usually belie a Servant's identity, diminishing that Servant's competitive advantage. Specific legends may be summoned with the aid of catalysts, which are artifacts, ideas, or experiences similar or of value to the desired Servant. Only one Servant can be summoned in each war from one of seven classes: Saber, Archer, Lancer, Berserker, Rider, Assassin, and Caster.
(taken and edited from wiki)

Picture	Real Name	Description
	Shiro Emiya	Shiro is the main character of the story. He is a serious yet helpful, hardworking, and honest teenager. His hobbies include fixing a variety of broken things, from VCRs to stoves, as well as cooking and cleaning. He has some slight talent with sorcery, though he was discouraged by his foster father Kiritsugu Emiya from improving his gifts. He is initially confused about the Holy Grail War and attempts to irrationally shield others from danger, including his own Servant, Saber.
	Saber	She is Shirō's Servant, an agile but powerful warrior. Loyal, independent, and reserved, Saber acts coldly but is actually suppressing her emotions to focus on her goals. Her class is considered the "Most Outstanding", with excellent ratings in all categories. Since her Master cannot effectively provide her with Mana, she minimizes her activity to preserve what she has. Saber is frustrated by Shirō's "protective" tendencies, believing his erratic and reckless behavior will jeopardize her chances of winning the Holy Grail War.
	Rin Tosaka	A model student and idol of Shiro's school who is secretly a sorceress and Master in the Holy Grail War. She is a descendant from a long line of sorcerers, and though she lacks a formal magic education, she is extremely powerful in her own right. Her father was killed in the fourth Holy Grail War, and she has trained since his death to succeed him. She is perceptive, resourceful and avidly competitive. She tried to summon a Saber-class Servant, but she accidentally called Archer instead.
	Archer	He is the Servant of one of the series' main heroines, Rin Tosaka. Due to an incomplete summon, he apparently has no memory of his previous life or identity. Archer is sarcastic and cynical - but under his hardened exterior lies a complex and dark personality that unfolds throughout the story. Though skilled with ranged weapons, he can hold his own in mêlée combat. Archer considers Shirō Emiya's idealism to be weak and delusional, recognizing Shirō's mentality of "wanting to save everyone" as naïve and impossible.