Yui Rio is one of the many students that attend Akademi High School.
Yui has red hair in a short sidetail to the right. Her bangs are swept to her left. Her eyes are bright red. She wears the default uniform unless customized by the player. She also wears a red friendship bracelet on her right wrist, and red stockings and panties.
Yui is Evil. If she sees a corpse or witnesses a homicide, she will wink and compliment Yandere-chan on her crime, then will run off in order to not be considered an accomplice. She will not talk to the player the next day after seeing them commit a homicide. If the player tries to take a picture of her, she will become annoyed. She cannot fight back.
At 7:05 AM, Yui goes to school. She walks to her locker at 7:10 AM and changes shoes. At 7:15 AM, she goes to the left side of the fountain and talks with Yuna Hina, Koharu Hinata, Mei Mio, Saki Miyu, Kokona Haruka, and Musume Ronshaku.
At 8:00 AM, Yui goes to class. She starts class at 8:30 AM, and leaves to go to the cafeteria to talk with her friends at 1:00 PM.
Yui walks back to class again at 1:30 PM and finishes class at 3:30 PM. After that, she heads to the Cooking Club and sits at a table until 5:00 PM. She then goes to her locker and changes shoes, then she goes home.