|Voiced by||Yoshiko Tanaka|
She disappeared along with her husband in the landslide of 1976, leaving behind only her son. After becoming trapped in the Other World she rejects becoming a Shibito, making her a Failed Shibito, and spends the next 27 years at the bottom of the dam.
After the floodgates are blown up by Shiro Miyata on Day 3, she and Omito return to their home in Arato where they are finally reunited with Tamon, their mutated figures appearing as humans to him as he is turning into a Half Shibito. Yoriko Anno eventually turns up, beating the two with a bat and taking Tamon with her.
Her name comes from Yoshiko Tanaka, the same actress that does her.