Fate/Stay Night is the story of a gathering of magic users to fight a war for the wish granting Holy Grail. Echo previously watched Fate/Zero... like a long time ago. A long, long time ago...So that's all fuzzy. It is a prologue to this story, and Echo takes it on anew.
More information on the game can be found here...
... Oh wait, its not officially available in English...
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One of the dozen something ones, at least.
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