Satou (佐藤, Satō) was a neighbor of the Kirishima family around the time when Arata Kirishima was caught by Yukinori Shinohara and Kureo Mado where she later sold out Touka Kirishima and Ayato Kirishima to the CCG.
In Seidou Takizawa's testament, he mentions that their then-neighbor Satou, was killed by a ghoul during his youth. It is not known if Takizawa's former neighbor Satou is identical with the former neighbor of the Kirishima family.
Satou was a stout middle-aged woman with shoulder-length curly hair.
She usually wore a dress with flowers printed on it.
Satou was a kind woman who shows concern for her fellow neighbors. She was fond of the Kirishima family as she gave them human food on a regular basis. However, her pretense was revealed after Arata Kirishima was taken by the CCG. To prove that Touka Kirishima and Ayato were ghouls, she forced them to eat human food; thus selling them out to the CCG.
After Arata Kirishima had been caught by the CCG, Satou lured Touka Kirishima and Ayato Kirishima in her apartment. To uncover their suspected ghoul identity, she forced Ayato to eat human food when the siblings refused her offer. Bureau investigators appeared from inside the apartment to capture the siblings. However, the siblings were able to escape, for Touka activated her kagune for the first time and used it against one of the investigators.
- The surname Satou means "help, aid" (佐) (sa) and "wisteria" (藤) (tou).