She is a spirit that Hachibe and Ryuunosuke met in the mountains during the summer where she was being plagued by ghosts, though it was later revealed that they are "fans" of her beauty.
After settling that matter it was believed she pasted over to the after life only to appear with Aburazaka later on, though he is unable to see her. It was later revealed she is not dead, but her body is in a comatose state. She is so far the only girl throughout the series that has more than just one of Hachibe's beloved parts, having three of them: butt, neck and waistline. She also seems that she has fallen in love with Seishirou Aburazaka after he revealed that she was alive in a coma. Her real name is Koino Sayo which was revealed in chapter 91.