Shinonome Sayaka

Shinonome Sayaka is Shinonome Azuma's aunt. She does not have a major role in the story, and is the second of her extended family to be used as her reserve tank and subsequently perish. She is forty five years old.

Appearance
Sayaka has short, shaggy blond hair and slanted eyes. Her face has some wrinkles that were not present when she was first married, and she is tall and thin. Either motherhood or being married to a pedophile - or both - has taken a physical toll on her as well as an emotional one. She has a stern face when not wearing any expression.

Personality
She is cruel to Azuma, denying her food for stretches as long as a month and hitting her with the blunt end of a knife in front of her son, Kazuya. She puts on a friendly face for neighbors, so nobody suspects what Azuma endures. Her husband believes that she must have known about him raping Azuma rather than having sex with her, and tells Azuma that this is probably what prompted her to become so cruel to Azuma. This is supported by her placing a dead roach in Azuma's food after her husband yelled at Kazuya for punching her.

According to her husband, Sayaka is a gentle wife and a great mother. She loves her husband deeply, and she seems to be depressed over him not being sexually attracted to her. She also loves her two sons with all her heart, crying when Hiroki died and always yelling at Azuma when she upsets Kazuya. Despite this, her actions towards Azuma are primarily what define her character, and she is overall an unlikable character that is given little to no redemption.