Mio is the bass player of the light music club; even though she acts mature, calm, and collected most of the time, she still freaks out from things she's afraid of or things that are gross or pertains to gore. Because of her extreme shyness, she chose bass over the more conspicuous guitar. She is so delicate that merely imagining herself being the center of attention almost makes her faint, but still plays bass quite well. Although, she is not altogether uninterested in joining a band outside school, the time spent with the light music club members is the time she enjoys the most, so she has completely devoted herself to the club. During the school festival performance in the fall of her first high school year she acted as lead vocalist instead of Yui, who had lost her voice. At the time it seemed like Mio might have overcome her stage fright, but after the performance ended, she tripped over a cord and fell, exposing her panties, and was traumatized anew.