『Haruka Takayama』

Yū's best friend since junior high school. She often unknowingly pushes Yū to her demands(like kissing her just to keep her quiet), although Yū begins to do it more frequently without Haruka's personal request. Haruka at times is the extremely jealous and clingy type of person as described by Yū. Haruka harbors romantic feelings for Yū, a reason why she is more affected by their seating arrangement than Yū is. Haruka fantasizes about Yū in almost every situation and is the most romantic one in the relationships. She seems self-conscious about her chest size, preferring her breasts were smaller, such as claiming that they are a C cup when they are in fact D cup. In the manga, she becomes the student council vice president during her third year. Haruka and Yū become an official couple at the end of the manga.