Yui is the main character of K-On!. She is one of the members of the light music club, and plays a Heritage Cherry Sunburst Gibson Les Paul Standard electric guitar that she nicknames 'Giita'. She does not get good grades in school (though when properly coached, she can achieve astounding results) and is easily distracted by trivialities. Yui is clumsy and easily spaces out most of the time. She takes a huge liking for any kind of food (but admits that she does not gain any weight). She has her younger sister Ui to take care of her and keep herself in line. She has a very easy-going nature, but has incredible concentration when hyped, though this is only limited to one subject at a time.