Shizuka's friend is an unnamed character in the series. She is commonly credited in the credits as Classmate (クラスメイト Kurasumeito) or Girl (女の子 On'nanoko, literally meaning female child), and is a background character of the series. She has been rumoured by fans as the wife of Dekisugi, due to her striking resembling to the wife and she was seen together with Dekisugi in one episode. Her most prominent appearance was in the episode Gravity Paint, where in she has a speaking role and treated as a supporting character in the episode.