Kageyama's wife (景山の妻 Kageyama no tsuma) is a housewife and the spouse of Kageyama, with whom she has three children.

She is a Japanese woman with a skinny build, pale skin, and short dark-brown hair. She wears a brown blouse, a black shirt, and a cream-colored skirt.

When Kageyama left Japan for a business trip, his wife was concerned that their 18-year-old daughter was getting home later and later. Some days later, she was preparing some food in the kitchen when she noticed her husband entering the living area. Admitting that she was surprised he came home that day, she expressed her concern about their first daughter's late arrivals to home, asking Kageyama to talk to the girl about it. Despite her communication, Kageyama ignored doing so, only answering that he thought raising their daughter was the wife's responsibility.