Keiko Numata

Keiko Numata is Ikuo Takabayashi's grandmother and Kensaku Numata's wife. She is the proprietor of Sakitani Kinenkan along with her husband.

Appearance
She is an old lady with greenish shot hair and green eyes. She wears a white T-shirt and a yellow apron.

Plot
Keiko made her debut in the anime in episode 10 when she welcomes a part of the 9th Grade Class 3 who came at the Yomiyama Shinre to pray for their safeness, hoping that this action will stop the calamity. The class accommodated at her restaurant-pension.

Trivia

 * In the original novel she killed Manabu Maejima,  Izumi Akazawa, Takako Sugiura, Junta Nakao,  Shigeki Yonemura and her husband with a knife at Sakitani Kinenkan and then she suicide by bitting of tongue. The reason isn't revealed in the original novel and still remains unknown.
 * Her first name, Keiko mean "blessed child". It's some kind of ironic that her name mean "blessed child" and she killed 5 students and her husband and then suicide.