In a certain regional city of Japan called Fuyuki City, a Holy Grail is said to appear once every few decades, capable of granting any wish to its owner. Seven magicians form contracts with seven heroic spirits and engage in the conflict known as the Holy Grail War to obtain the Holy Grail. Rin Tohsaka, who was raised in a family of magicians, also aims to participate in the Holy Grail War, following her father Tokiomi Tohsaka's legacy. However, as she attempts to summon the greatest heroic spirit Saber, things take an unexpected turn...