Murray is Jamish's adopted half-brother under Ventura, and was initially tricked by the Fallen Angel Sword, Mikhail, to slay Sam Masamune under the impression that Sam was his father (he's not).

Ventura took him in and vouched for Wunderkammer LTD. to neutralize Mikhail's Fallen Angel powers and while Murray still needs to have the sword near him at all times to live, the demonic possession is no longer... malignant. Regardless, he's taken by Ventura after he is rejected by his parents due to his condition, and the phantom thief works to help treat the long-term side effects of being Corrupted.