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"The Case Files of Lord El-Melloi II" is a Japanese light novel series written by Makoto Sanda. The series is a spin-off of the popular anime and light novel series "Fate/stay night", and follows the adventures of former mage and now detective Lord El-Melloi II (Waver Velvet).

The story takes place several years after the events of "Fate/Zero", and follows Lord El-Melloi II as he investigates various magical mysteries and cases in the world of the Holy Grail War. Along with his apprentice Gray, he must navigate the dangers of the magical world and outwit his opponents to solve each case.

The light novel series has spawned an anime adaptation, which premiered in July 2019. The anime follows the same format as the light novels and features twelve episodes, each focusing on a different case. The anime also features appearances by characters from the "Fate/stay night" franchise, including Rin Tohsaka, Shirou Emiya, and many others.

Overall, "The Case Files of Lord El-Melloi II" is a thrilling and engaging spin-off of the "Fate/stay night" franchise, with complex mysteries and intriguing characters that will keep fans of the series coming back for more.