Keiko Numata

Keiko Numata (沼田 峯子, Numata Keiko) was the wife of Kensaku Numata and the grandmother of Ikuo Takabayashi who is the proprietor of Sakitani Kinenkan along with her husband.

Appearance
Keiko is an overweight elderly woman with short brown hair that is swept to the left and brown eyes.

She wears a white t-shirt and a yellow apron.

Personality
Keiko was introduced as a kind, gentle and welcoming grandmother, but she soon manifests a cold murderous side of herself.

At the end of Episode 12, Tatsuji Chibiki mentions that she and Kensaku Numata were emotionally depressed about the death of Ikuo Takabayashi, their grandson. This, along the fact that the calamity seems to affect people in a way that makes them do things that they would normally never do, may have lead to Keiko plot a revenge murder spree in the last two episodes.

Plot
Keiko was first seen in Episode 10 when she and Kensaku Numata welcome part of Class 3-3 who came at the Yomiyama Shrine to pray for their safeness, hoping that this action would stop the calamity. The class was accommodated at her restaurant-pension. Unbeknownst to anyone, she was mentally unstable, and after dinner she began preparations to murder her husband and set the place on fire.

In Episode 11, she was eventually revealed to have gone insane to the point of wanting to murder everyone else. By this point, Keiko had already killed her husband in a very brutal way and started a fire in the dining room. Manabu Maejima witnesses this, and Keiko stabs him, though he manages to survive. 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. After Mochizuki and Naoya escape from Keiko, he opens an emergency door and Keiko was inside waiting to kill them.

In Episode 12, when Mochizuki and Teshigawara escape by the window, she grabs Mochizuki's leg. Teshigawara grabs Mochizuki and pulls both of them out of the window. She grabs Teshigawara and tries to kill him, but was stopped by Tatsuji Chibiki who stabs her to death.

Etymology

 * The name Keiko means "top, peak, summit" (峯) (mine) and "child" (子) (ko).
 * Her name is translated incorrectly in the anime as "Keiko", due to the enormous number of values of kanji, as in the original novel in Japanese her name "Mineko", in fact, 峯 (mine) means "top/peak" and 子 ("ko") means "child", respectively. Even more confusingly, the official English translation of said novel renders her name as Meiko. No official name has ever actually been given.
 * Keiko's surname Numata means "swamp" (沼) (numa) and "field, rice paddy" (田) (ta).

Trivia

 * In the original novel, Keiko killed Manabu Maejima, Izumi Akazawa, Takako Sugiura, Junta Nakao, Shigeki Yonemura and Kensaku Numata with a knife at Sakitani Kinenkan where she then proceeded to commit suicide by biting off her tongue.
 * The reason for this wasn't revealed in the original novel and still remains unknown. In the anime, her body count is significantly lower (apparently limited to just her husband), though not for want of trying as she was hunting Yuuya Mochizuki and Naoya Teshigawara from the second half of episode 11 to the first half of Episode 12.
 * While everyone else is focused on Izumi and Mei Misaki's confrontation at dinner, there are two scenes showing Keiko preparing to murder her husband and burn the inn to the ground.

Gallery

 * Main article: Keiko Numata/Image Gallery