Ichiko Takashima

Ichiko Takashima (高島 一子 Takashima Ichiko) is, in fact, a ghost. Her story begins 22 years ago: a previous Elder (who later became Mizuho Miyanokouji's mother) had a close relationship with an underclassmen who had a weak body. The underclassman was hospitalized but desperately wanted to see her Elder so she sneaked out of the hospital, went to the Elder's room to wait for her. Unfortunately she died before she had the chance to talk with the Elder. That room has been deemed a "closed room" ever since, until Mizuho arrived and started living in it, in accordance with his grandfather's will.