Kei originally appears in the manga Getter Robo Go. She is an assistant of Colonel Hayato Jin and a mechanic for NISAR, appearing in the later volumes of the series.

Her character is featured again in the alternate-universe OVA Getter Robo: Armageddon, this time named Kei Kuruma and as the "daughter" of Benkei Kuruma. She forms part of the new Getter team alongside Go and Gai, piloting the Shin Getter-2. She is truly the daughter of Professor Saotome, raised as a boy until she became amnesiac and Benkei took her in.