Mythical Detective Loki Ragnarok

Mythical Detective Loki Ragnarok is a manga by Sakura Kinoshita published from August 1999 to October 2004. A television anime based on the manga series ran for 26 episodes from April 5, 2003, to September 27, 2003, in Japan.

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 human girl named Mayura Daidouji who is manic for mysteries and often unwittingly assists him in catching the auras. As time passes, however, other Norse gods and characters appear; some befriend Loki and others are intent on assassinating him.

-Second Night - The Allies of Justice are Totally Broke?! (Episode 2)
Mayura got possessed by the sword's evil aura.

-Third Night- The Descending Assassin (Episode 3)
Mayura decides to go to the zoo with her friends. While there, Heimdall sends down a bird that hypnotises her. She is quickly snapped out of her trance by Loki. It is later revealed that Heimdall had also hypnotised the zookeeper, who kidnaps Mayura

-Twelfth Night- The Trap of Dracula's Castle (Episode 12)
A monster from the world of Gods disguises as a vampire and hypnotizes both Mayura and Kou in a virtual reality world.

-Fifteenth Night- Beautiful Assassins (Episode 15)
Mayura is possessed by Odin.