根据原作者奈须说明，如果Fate/stay night是描述情侣面对逆境的故事，Fate/Zero就是以魔术师互相杀戮的比赛。因为是系列的前传，故登场人物除Saber和Gilgamesh外与Fate/stay night完全不同。该作讲述的是第四次圣杯战争时的故事。

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