水無瀬 紗由理

A member of the piano department. Commonly known as the 'Rose Princess', she is the most honorable student in the academy, and her family is well-known. A genuine Ojou-sama.
Her manners, academics, and musical skills are top-notch, and her beautiful appearance makes her an icon at her school.
She's smart and sharp, but is naive about the world. She has an instinctive dislike for the main character. 
As Representative of the piano department, she organizes all the students in it and has close relationship with the other representatives.