Matantei Loki Ragnarok

Matantei Loki RAGNAROK (魔探偵ロキ RAGNAROK) is a Japanese manga by Sakura Kinoshita published from August 1999 to October 2004 by Monthly Shōnen Gangan. Originally under the title, Matantei Loki (魔探偵ロキ), it was extended when the publishing moved to MAG Garden's Comic Blade magazine, and the rest of the tankobon volumes resumed publication. An anime adaptation based on the manga series ran for 26 episodes from April 5, 2003, to September 27, 2003, in Japan, and licensed for English release by Section 23 Films.

Plot
Loki, the Norse god of mischief, has been exiled to the human world by the god Odin for reasons that he doesn't understand. Along with being exiled, Loki is forced to take the form of a human child, and the only way he can return to the realm of the gods is by collecting the evil auras which take over human hearts. In order to do this, he starts a detective agency which specializes in the paranormal. Loki is assisted by his loyal companion Yamino and the pair are soon joined by a high school girl, Mayura Daidouji who is a mystery-maniac and often unwittingly assists him in catching the auras. As time passes, however, other Norse gods in human forms appear, some of whom befriend Loki and others of whom are intent on assassinating him.