Matantei Loki Ragnarok

A new god appears, Frey (Freyr), as a thief. He steals many things and Loki has no interest in the robberies until he discovers that Frey is also going to steal the Briggsamen necklace. Frey challenges Loki to stop him. Loki goes to meet him when Frey steals the necklace, but is unable to stop him. We learn that Freya is his sister, and that she may be on Earth.