It is the new year, meaning the senior members of the Light Music Club are now third-years, with Azusa Nakano as the sole second-year. The seniors soon realize that Azusa will be the only member remaining after they graduate and decide to recruit new members. Despite attempting various methods to attract underclassmen—distributing fliers, inviting people into the clubroom, and performing at the welcoming ceremony—there are no signs of anyone intending to join. While heading to the clubroom, Azusa overhears Yui Hirasawa stating that the club is fine with just five people and that they can do many fun things together. Changing her mind, she decides that they do not need to recruit any members for the time being. K-On!! revolves around the members of the Light Music Club as they experience their daily high school life. From rehearsing for concerts to simply messing around, they are ready to make their last year together an exciting one!