Four Japanese high school girls join Sthe akuragaoka Girl's High School's light music club and try it to save it from being closed. The girls are the only members in the club and most of them have no idea to how to play music. Yui decides to take up the electric guitar. Ritsu plays the drums. Mio plays the bass and Tsumugi plays the keyboards. The girls start to practice. A year later, freshman Azusa joins the group and they form the band After School Tea Time.