|Appears in:||Manga, Anime, Game|
|Japanese Voice:||Chiaki Takahashi|
|English Voice:||Colleen Clinkenbeard|
Yua has long, pale blonde hair and dark green eyes. She has a long and slender frame and is always seen dressed neatly.
Before confronting Takumi, Yua was a very indecisive and shy girl, so much so that she showed a genuine fear of going into a theme store alone, lest she be embarrassed. She is also shown to very caring, she went out of her way to meet Takumi and wish him well on multiple occasions. Her and Takumi formed a very close relationship, yet in actuality it was all a charade in an effort to obtain information from him.
However, her personality flips in entirety when she confronts Takumi about his role in the murders. Cold and calculating, she slowly picks Takumi's very reality apart as he stands paralyzed with shock, and she seems to care little for the "Friendship" they briefly shared, despite Takumi's feelings. After explaining her true intentions, she appears to pity Takumi for his disability and psychosis, but leaves him to his own thoughts as she exits.
Yua is a third-year student at Suimei Academy who seems to be stalking Takumi but later seemingly befriends him. She seems to be quite into anime and manga. However, this is all later shown to be an act where she is investigating him as she suspects Takumi of being the criminal behind the recent murders. Her observations eventually lead her to confront Takumi; betrating his friendship while also revealing his blatant megalomaniac events. Her work reveals that Takumi is innocent of the murders, yet highly unstable and is the victim of extreme psychosis. Takumi's sense of reality is shattered and he is deeply distressed by Yua's manipulation of him.