Kyouko transfers into Fujimi High School and into Kozue's class. She is a former tennis player, forced to quit sports because of her mother's intense wishes for her to focus on getting into an advanced university. 

Source: Wikipedia

Kozue Ayuhara is a highschool girl and enthusiastic volleyball player. Her dream is to play in the Japanese national volleyball team. During the series she makes it from the school district league up to the Japanese volleyball finals, step by step till the international volleyball championship. But the faster and higher Kozue climbs the career ladder up, the more she gets confronted with the dark side of success: too high expectations, self-conceit and envy are progressing towards serious problems.
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(Source: Anime News Network)

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The story is about Kozue Ayuhara, the new girl who transferred to Fujimi College, who tried out for the school volleyball team. Her friendship with Midori would develop, and her talents would impress coach Honga more and more each day. Though she showcased extraordinary volleyball skills, she would make enemies with Yoshimura, the star of the current team. Kozue would discover that being at the top would bring stress, incompatibilities and other dilemmas into her life. Her high expectations of becoming the best volleyball player in the school, Japan and eventually the world, would set the tone for the drama to follow. <br><br>(Source: Wikipedia)

Kyouko Makimura