Yui is a playful, laid back and informal 17-year-old girl who marches to the beat of her own drum. Initially her love of candy was played up as her primary quirk; it faded into a minor trait as her character developed. She became best friends with Aikawa Chinatsu after befriending her at the game's first New Year's event. In fact, one of her stages of evolution leading up to a swimsuit S Rare features her wearing Chinatsu's glasses.
She has been known to tease the Producer about indirect kisses when she offered him a lick of her lollipop, which is her favorite food. She refers to the Producer with the “-chan” honorific.
In the tie in Cinderella Girls Theater skits, Yui is a fun loving and excitable teen. She loves the freedom some roles give her, particularly that of a pirate. She tries to be mature by bringing her version of a hot drink to an onsen, but finds the cola to be disgusting due to it having gone flat. She is friends with Chinatsu and Mary Cochran. She wanted to walk with the Producer under an umbrella together and tried to get a taste of Mochizuki Hijiri’s cake until Hijiri began to cry in worry for a sugar figurine’s life. Yui is quick to point out that Ohta Yuu’s chocolate figure is suspicious and hopes Akky isn’t in any danger.
