The one who obtains the Holy Grail will have any wish come true.
The Holy Grail War. A great ritual that materializes the greatest holy artifact, the Holy Grail. There are two conditions to participate in this ritual: to be a magus, and to be a "Master" chosen by the Holy Grail.
There are seven chosen Masters, and seven classes of Servants; beings akin to superhumans with incredible fighting abilities. There is only one Holy Grail. If you wish for a miracle, prove that you are the strongest with your powers.
Emiya Shirou is a high school student who has learned rudimentary magic from his father and uses it to fix objects. He finds himself engaged in the Holy Grail war as he gets attacked by a Servant. As he gets cornered, he somehow summons his own Servant and manages to stay alive long enough to compete against the other Masters.
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This review contains spoilers
One of the reasons is, almost the whole route plays in Shirou's house, any bit of action that occurs is when a Servant dies.
This isn't too bad...but compared to Saber's and Rin's route it just falls sort. Anyway, this route is pretty wild, Shirou is forced to ignore his ideal (which if you are playing this, you know how important that is to him), they even kill a certain Servant which to this day I can't believe they killed, what happens to Shirou's arm, a multidimensional sword, like dang, if only Sakura wasn't such an awkward villain (I mean, she never wanted what happened to her, so I guess it makes sense).
Also, this route has some Tsukihime paralels, dark story, someone killing people in their dreams, blood sucking, and sex, this one has a lot of sex
This review contains spoilers