The Light Music Club engages in relaxed and straightforward activities, or so the carefree Yui Hirasawa initially assumes. When Yui goes to formally quit the club, she discovers that her departure would leave the club without enough members to continue its activities. This places Yui in a sudden dilemma. However, its members—the mature Mio Akiyama, the playful Ritsu Tainaka, and the ladylike Tsumugi Kotobuki—decide to perform an instrumental piece in an attempt to keep Yui. The song not only fills her with excitement, but it also leads her to decide to remain in the Light Music Club. While the sounds of cheerful girls fill the clubroom of the Light Music Club, the members juggle both schoolwork and their love for music. They may play around once in a while, but that makes the high school life in K-On! even more exciting!