She is Tsurumi sweet and lovely grandmother. In the family she seems to be the only one that always accepted him for the "gift" (ability) he gained, helping him to living together this thing of his. She calls her nephew "Gin-chan" and is a very cheerful person.
The funny grandmother is a medium and actually really has "powers", well at least she explains her abilities as high developed smell, hearing and view. She doesnt have any alien in her mind, she is just a special person.
The grandmother often asked Tsurumi to bring her Komaki, 'cuz seems he talked to her about the girl, and the old lady was pretty curious to know her. Komaki meets her when she fear to be followed by a ghost.