Shijima Kurookano (黒岡野 しじま)

When not in human form, Shijima is disguised as Miharu's cat, Shiratama, and has been since before Miharu's birth. She is similar in appearance to the spirit of the Shinrabanshou.

Like Aizawa, she has survived experiments performed by the holder of Shinrabanshou, a medical practitioner, during the Edo Period. The holder used the Shinrabanshou to give a human heart to a cat, who became Shijima. Because of these experiments, it is implied she is at least a century and a half old.