Several months after their New Years' live performance, the light music club has returned to Sakura High for a new school year. Now seniors in Sawa-chan's homeroom class, Yui, Mio, Ritsu and Mugi commence their final year as high school students. While many others would fret about their entrance examinations, the Keion Bu have more important things on their minds, be it shopping for shelves, cleaning out the storage room or that age old problem of trying to recruit new members. But while there's music, snacks and school trips aplenty, one question still remains... will the girls be able to leave their mark on the school before they graduate?