Having a friend who knows you inside out should be good, but in Nishikata's case, the opposite is true.

His classmate Takagi loves to tease him daily, and she uses her extensive knowledge of his behavior to predict exactly how he will react to her teasing, making it nearly impossible for Nishikata ever to make a successful comeback. Despite this, Nishikata vows to someday give Takagi a taste of her own medicine by making her blush out of embarrassment from his teasing.