Showa Era's woman of twenty faces, Chikage is the renowned thief Phantom Lady. She retired after Toichi took over as Kaitou KID after saving her life. It's unknown as to how long she was a thief for or why she became a thief, but after her retirement, she married Toichi, moved to Japan, and gave birth to her only son Kaito. Chikage travels abroad frequently and as a result is neglectful of Kaito, respecting his need for space as Kaitou KID.
During her travels abroad, Chikage continued her phantom thief career behind Kaito's back. She is the infamous Kaitou Corbeau of Las Vegas and has dozens of other phantom personas throughout the US and other countries. Her goal? The same as Kaito's: track down Pandora in locations that Kaito cannot.