The character known as Grandma is the mother of Tetsuo Kinoshita, making her the paternal grandmother of protagonist Tomoo and his sister Kimiko. She has already passed away before the events of the series begin. Despite her physical absence, Grandma maintains a presence through the memories of her husband, Grandpa. Whenever Grandpa finds himself facing a difficult situation or wishing to offer advice to others, he recalls her words. In these moments, she often appears in his mind as a guiding voice or vision, offering wisdom in the form of proverbs, sayings, and practical suggestions. Her role is therefore to provide counsel to Grandpa from beyond the grave, indirectly influencing his actions and the advice he passes on to the family. This mechanism allows her character to continue shaping the lives of the Kinoshita household. Her key relationships are defined by her family: she is Tetsuo's mother, Grandpa's late wife, and the grandmother of Tomoo and Kimiko. No information is available regarding her personal development across the story or any notable abilities beyond her function as a remembered source of wisdom.