Behind every strong man stands someone who supports him, comforts him, struggles with him and succeeds with him. Kageyama has such a person as his foundation and if anything would happen to her, he would shatter. [Ushiwaka/OC] This story revolves around Kageyama's older sister, a student at Shiratorizawa Academy and fellow classmate of Ushijima Wakatoshi. She leads a tough life, especially when the volleyball boys want her to be the manager. She gets along well with all of them but one day, the friendship between her and the Grand Ace seems to change.