The Case Files of Lord El-Melloi II (Japanese: ロード・エルメロイII世の事件簿, Hepburn: Rōdo Erumeroi Nisei no Jikenbo) is a Japanese light novel series written by Makoto Sanda (Rental Magica) and illustrated by Mineji Sakamoto. Officially part of the Fate series, it began serialization by Type-Moon under the Type-Moon Books imprint on December 30, 2014 to May 17, 2019. The novels are set between the events of Fate/Zero and Fate/stay night, focusing on Lord El-Melloi II, a former master who now investigates several mysteries after his participation in the Fourth Holy Grail War. A sequel novel series, The Adventures of Lord El-Melloi II (ロード・エルメロイII世の冒険, Rōdo Erumeroi Nisei no Bōken), began publishing on December 25, 2020. Two media adaptations were officially made: a manga adaptation by Makoto Sanda with illustrations from Tō Azuma began serialization in Kadokawa Shoten's Young Ace magazine on October 4, 2017 and an anime adaptation by Troyca, which adapts the Rail Zeppelin chapter, aired from July 6 to September 28, 2019. On December 31, 2018 and December 31, 2021, the anime adaptation broadcast special edition episodes. Source: Wikipedia (en)