Fate/Zero

Fate/Zero (フェイト/ゼロ Feito/Zero) is an anime series based on the light novel series written by Gen Urobuchi and illustrated by Takashi Takeuchi. It is a prequel to the Fate/stay night anime series. Its first season ran from October 1 to December 24, 2011 while the second season ran from April 7 to June 23, 2012.