As the new year begins, the Light Music Club's senior members ascend to their third year, leaving only Azusa Nakano as the second-year member. Gearing up for graduation, the seniors realize the need for new members and try various means of recruitment, including distributing fliers, showcasing their performances, and welcoming new students. However, their efforts prove futile, and the club remains stagnant in terms of members. Witnessing this, Azusa feels apprehensive about the club's future until Yui Hirasawa assures her otherwise. During their walk to the clubroom, Yui state the club's contentment with the existing five members and their exceptional bond, persuading Azusa to change her outlook and enjoy their final year together. K-On!! takes us on a journey with the Light Music Club members as they navigate through their final year of high school, sharing their daily lives and practicing for upcoming concerts, making every moment count.