Azusa is a student in the same year and class as Yui's sister Ui, who joins the light music club and plays a Fender Mustang electric guitar. She is a self-proclaimed novice guitarist who has been playing the guitar since she was in the fourth grade, and her parents are working in a jazz band. She often finds herself bewildered by the tea parties and cosplaying aspects of the club, when she would rather just practice and is curious on how the club is able to play so well despite their problems and lack of practice. However, she has a certain weakness for cakes and can be calmed down rather easily, sometimes by just being petted. She is constantly a victim to Yui's skinship and is nicknamed Azu-nyan after trying on a pair of cat ears and meowing. Despite this, Azusa is not too good with cats.