Shizuka Kitaumekawa is the wife of Daichi Kitaumekawa and the mother of Minori Kitaumekawa. Shizuka is the dutiful housewife of Daichi. She only sees her husband in a positive light

Spoiler

and is oblivious to his dark and obsessive side. This is shown evident when Daichi is arrested after being reported for taking advantage of his students and Shizuka looks on in shock with Minori.

(Source: Happy Sugar Life Wiki)