Emiya Shirou can be. One day after cleaning the Archery Dojo in his faculty, he catches a glimpse of a struggle between superhuman beings, and he has involved in the Holy Grail War, a ritual at which magi called Experts struggle eachother using their Servants to acquire against the Holy Grail. Shirou joins the struggle to prevent an evil doer from winning the Grail also to save innocent people, but everything goes wrong when a mysterious"Shadow" begins to kill people in Fuyuki...