The original Fate/Zero series was a collaboration between Type-Moon and Nitro+. Its publication history includes several editions: Fate/Zero is a masterpiece and you should watch in now.
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For those who may not know, Fate/Zero is a prequel to the Fate/stay night series, exploring the events leading up to the main story. It's written by Gen Urobuchi and illustrated by Takashi Takeuchi. The original Fate/Zero series was a collaboration between