Jun is an outgoing girl and a friend and classmate of both Azusa and Ui from before they joined the light music club. Ui at first tried to get Jun to join the light music club but ultimately failed due to a strange visit to the club room. Thanks to this experience, Jun stayed in the Jazz club instead. While there she played a Yamaha Sbv500 bass. Jun became one of Mio's admirers because they both play bass.