The Mythical Detective Loki Ragnarok (魔探偵ロキ RAGNAROK, Matantei Roki RAGNAROK?, lit. Demon Detective Loki: RAGNAROK) is a manga by Sakura Kinoshita published from August 1999 to October 2004. A television anime based upon the manga series ran for 26 episodes from April 5, 2003 to September 27, 2003 in Japan.
The series originally ran in the magazine Monthly Shōnen Gangan under the name The Mythical Detective Loki (魔探偵ロキ, Matantei Loki), but Ragnarok was added to the title when the series was purchased by publishing company MAG Garden and moved to Comic Blade magazine. The Mythical Detective Loki was collected in 7 volumes by Gangan Comics, which were later republished by Blade Comics; it has not been officially licensed for US distribution. The Mythical Detective Loki Ragnarok ran for 5 more volumes, which were published in Japan by Blade Comics, and picked up for translation and English release by ADV Manga. Chuang Yi has released an English version in Singapore. The anime has been licensed for English release by ADV Films. The anime series is also being broadcast across South America by the anime television network, Animax, under the name Mythical Sleuth Loki.
The fact that the second manga series has been licensed in North America without the first series is a source of some controversy among fans in English-speaking countries, as the second series is a direct continuation from the first and refers back to previous events frequently. Both series were licensed in Singapore.