Koneko is a petite cat-girl with white hair and gold eyes. She is a half human half Nekomata. After the death of her parents in an accident, she was reincarnated as a devil and taken into the Gremory house under Rias gremory. As a result She has a cold and quiet personality. But when someone gets to know her better she opens up to them. She starts developing feelings for Issei Hyoudou as she discovers his dedicated, protective and brave nature hidden behind his perverted behaviour.