He promised to be a Hero capable of saving everyone. But before that he made other promises he can't remember under a different name. How will Shirou react when he finds his lost past? - Shirou/Multi Mature Contents.

How does the Grail choose a Master or a Servant? Fact of the matter is, it knows the difference between want and need. Masters of the Fourth Holy Grail War know they want a strong Servant, but the Grail knows the Servants they need.