|Anime Debut||Episode 2|
|Voice Actor||Linda Leonard|
Sachiko Tanaka (田中 佐知子 Tanaka Sachiko) is the wife of Yoshikazu Tanaka and the mother of Akira Tanaka and Kaori Tanaka. In the novel, she first appears at the roadside diner with her daughter, discussing the whereabouts the residents of the Kanemasa mansion.
At 9pm on August 11th, she receives a phone call about Megumi Shimizu. She went missing and hasn't returned home yet. She asks Kaori if she had seen Megumi. She tells her that she left her at the gate to the mountain.
Love starts barking at him, causing Sachiko to come outside. He hides but eventually greets her. She becomes very frightened, thinking that he is a ghost. He tries to comfort her but she wont listen and yells at him to go back to his grave and stop haunting them. As she crawls away, he grabs her feet. While crying, he attacks her.
Sachiko genuinely loves her family, though she can be strict and overbearing. When frustrated, she often acts bitterly.
After Yoshikazu Tanaka is bitten by Megumi Shimizu, he eventually dies from blood loss and rises as a Shiki. Megumi convinces him to attack his family for survival. When he arrives back home, Love turns aggressive towards him. The dog's barking alerts Sachiko, who comes out to see what all the commotion is about. Yoshikazu surprises his wife and after a brief argument, he overpowers and bites her. She eventually dies from having her blood drained, but does not come back as a Shiki.
- The name Sachiko means "help, aid" (佐) (sa), "knowledge" (知) (chi) and "child" (子) (ko).
- Sachiko's surname Tanaka means "field, rice paddy" (田) (ta) and "middle" (中) (naka), which literally means "dweller in the rice fields" altogether.