She is a reincarnated Devil and member of the Occult Research Club who originally belonged to a rare species of nekomata (cat demon) called a Nekoshou.
As a child, Koneko's parents died, and she and her older sister, Kuroka, were taken in by a Devil from the House of Naberius. However, her new master planned to use Koneko in unethical experiments to create a Super Devil. To protect her, Kuroka killed their master and became a Stray Devil, a crime that put Koneko at risk of execution by other Devils.
She was saved by Sirzechs Lucifer, who entrusted Koneko to his sister, Rias Gremory. The trauma of these events caused Koneko to suppress her emotions and her nekomata powers. causing her to become slightly.
Dominans