She is the "helicopter mother" of the protagonist's friend, Rei. A helicopter parent being a term that refers to a parent who pays extremely close attention to a child's or children's experiences and problems, particularly at educational institutions. They are named as such because, like helicopters, they "hover overhead", overseeing every aspect of their child's life constantly.
Heart-Pounding Helicopter Mom
One day the little Naoyuki visited Rei's home in order to play with his friend and classmate, however Rei was busy with his homework. So he remains waiting for him with the strict mom of Rei, but he had a good time in find out a softer side of her.
