Ryoba Aishi is the mother of Ayano Aishi, the protagonist of Yandere Simulator. Ryoba attended the same school as her daughter in the late 80s. She has lived in the same neighborhood for her entire life.

She is a cheerful and friendly woman who seems to get along very well with everyone in her neighborhood, although nobody seems to know very much about her, not even her next-door neighbors.

She is a very private woman who never talks about herself, and never divulges many details about her occupation...but she's always willing to talk for hours about her husband and how much she adores him.