Yui is a girl who's easily distracted by cute things and tasty food. She's a crybaby but cheers up easily if she gets some sweets. She eats a lot of sweets but she does not gain as much as she eats, she said to herself. In many ways some may say she's a child, and making sure she practices is a problem. When Yui takes good care of something, like her electric guitar- Gitah, she sleeps with it, plays, dresses up with it, and even has tea time with it. When she wants to remember something, she forgets everything else. Yui's energy seems to come from cake. She is a clumsy, scatterbrain but optimistic and kind-hearted.