Kuroka is the older sister of Koneko (then known as Shirone) who was born to a Nekoshou called Fujimai and a human researcher. After losing her parents, she and her sister were later taken in by an unnamed Devil from the branch family of the House of Naberius, and she was reincarnated as the Devil's Bishop using up two Evil Pieces. While serving her master, Kuroka became extremely talented in Senjutsu and Youjutsu, and her magical power as a Bishop became so great that she surpassed her own master in terms of magical power alone. you don't cuck issei cause although it's funny asf, it isn't fair to do to the poor guy.😭 so, enjoy my twist on kuroka and yes, just like shirone(koneko) she is made with the novels included but just like with koneko, you replace issei.