Ritsu's first impression of Yui was that she was a clumsy, childish, and useless girl without tempo. But when Yui joined the Light Music Club, Ritsu stated that she misjudged her. Soon, they became really good friends. Yui and Ritsu have a lot in common, such as their lazy and laid-back attitudes. They also have a sweet tooth for Tsumugi's treats, and are frequently the first to propose a break during practice.

Yui usually thinks that Ritsu is in the same boat as her and got disappointed when she found out that Ritsu does well on her exams and takes good care of her drums.

Despite acting immature herself most of the time, Ritsu sometimes criticizes Yui's odd behavior or thoughts.