朱音 スミ

Rin's grandmother from her father's side of the family. Sumi hasn't seen Rin since the summer she looked after Rin during Rin's childhood. She was concerned about Rin for a long time, but she fell ill and passed away. Sumi was kind to anybody, and wasn't prejudiced against ayakashi. During her lifetime, she took in Gin, a youko, and adopted him.