She is in the same year and class as Ui and Jun, and has quite a mysterious demeanor. 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 hugged by Yui and is nicknamed Azu-nyan (nyan, when suffixed, means cat-like) after trying on a pair of cat ears and meowing. Despite this, Azusa is not too good with cats. In the band, she looks up to Mio the most due to her maturity and the fact that she is an experienced bassist. She even tries to give Mio chocolate on Valentine's Day. However, she sometimes unintentionally makes remarks concerning Mio's weaknesses, such as her weight. Since joining, Yui comes to her for advice on playing guitar, as well as maintenance. She gets a tan very easily, once during their time at the beach and another during a music festival (even after applying sunscreen).