High school student Kuroha Shida is convinced that her childhood friend and next door neighbor, Sueharu Maru, is in love with her. Kuroha's dreams are shattered, however, when Sueharu admits that he has feelings for Shirokusa Kachi, a beautiful girl who is the school idol, an accomplished writer, and a gravure model. When Sueharu discovers that Shirokusa already has a boyfriend, Kuroha suggests that she and Sueharu embark on a plan of "revenge" together.