|Height||157 cm (5' 2")|
|Occupation||Violinist (former), waitress|
|Anime debut||The Girl Genius' Challenge|
|Japanese voice actor||Chisako Tatsumi (game)|
(drama CD, anime)
|English voice actor||Rozie Curtis|
Rie is a beautiful young girl with indigo blue hair and eyes. She wears the school uniform.
We first see Rie when she lends Kotomi a violin for her to practice with it. Later, while the members of the Drama Club go to Koumura to ask him to become their advisor, he tells them that he had already been asked by Rie to be the advisor of the chorus club. Rie decides to give Koumura to them, but her friend Sugisaka sends a threatening letter to Nagisa and tells the Drama Club about Rie's situation. Despite Sunohara's fury, Nagisa decides to give up on Koumura. However, after Yukine reads his fortune, Youhei comes up with the idea of challenging the Basketball Team to a match so the Choir Club will be moved and will agree to give them Koumura. After they win the match, Rie and her friends decide to share Koumura, something which Tomoyo agrees to once she becomes student council president.
Rie is in the same grade as Nagisa when she is forced to repeat her third year again and is one of the few friends she has. She does not join the Drama Club because she is too busy with the Choir Club but still talks to Nagisa at school. She attends her fake graduation ceremony and starts working at a family restaurant with Sugisaka while also studying to enter a music school. She eventually gets Nagisa to work at Ernesto Host as with her. She is last seen living with Sugisaka in an apartment.
- Rie Nishina closely resembles Rika Furude from .