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.

Personality
Keiko seemed a kind, gentle and warm-hearted grandmother. But she proved to be an insane crone and a murderer.

Plot
Keiko was first seen in episode 10, when she and Kensaku welcomes part of Class 3-3 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. In Episode 11, she was revealed to be the killer. After Yuuya Mochizuki and Naoya Teshigawara found her in a room with a bloody knife, she attempted to kill them. In the process, Yuuya pushed her away from Naoya, causing her to drop her knife and wound the latter's leg. She continues after the two down the hallway. Keiko also killed his husband in a very brutally way and started a fire in the dinning room prior to this. The reasons for her insane actions are still unknown.

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 off her tongue. The reason isn't revealed in the original novel and still remains unknown.
 * Her first name, Keiko mean "blessed child". It's ironically that her name mean "blessed child" while she killed 5 students, her husband and then suicide.