She's actually the wife of Shiro/Kojirou in real life, as well as the mother of Ichi and his siblings. Following the death of Aya, she would move out into a net cafe, where she's lived ever since. Her mental health seems to be in a very poor state - although she still cares for her sons and husband when she decides to visit their house, she seems to be largely just going through the motions without thinking much of her actions, repeating the same phrases repeatedly and often smiling in moments that don't require her to.
