The Holy Grail War - A death-match between 7 magi (Masters) and their summoned heroic spirits (Servants) in which the prize is the legendary Holy Grail, said to have to power to grant miracles.
This is now the 4th Holy Grail War. The 3 preceding Wars had ended without a victor. In pursuit of their individual goals and ambitions, the magi congregate at a place called Fuyuki. All the magi will do anything, rationalize away any atrocity, in pursuit of the Holy Grail.
All of them, but one...
Kotomine Kirei is a mage, but one without a reason to fight. Unable to release himself from the threads of fate, he is drawn reluctantly into this War.
However, as fate would have it, one of his rival Masters turns out to be an old enemy, Emiya Kiritsugu, a man more severe and merciless than anyone else. A man who desires the miracles offered by the Holy Grail...