Miyori's grandmother lives near the forest in Komori Village. She takes Miyori into her care after the girl's parents separate and her father feels unable to manage childcare alongside his work. Locals view her as a wise woman and recognize her as the current human guardian of the forest; some also call her a witch, though a benevolent one. Her home contains an upper attic holding an array of mysterious artifacts, suggesting ties to spiritual traditions.

She shows patience and understanding towards Miyori's initial resentment and struggles adapting to rural life. Her responsibilities include safeguarding the forest and its spirits, a duty linked to her standing within the village community. Official media sequels continue Miyori's story in the village and forest but do not elaborate on the grandmother's background, personal history, or development beyond her established roles as Miyori's caregiver and the forest's guardian.