If I could choose, I would like to be admitted to a girls' school, where I can live my own life and display my own youth.
Bingling, Qingrou, and Hongzhi are members of the Rose family. They are the presidents of the student union at Li'an High School. They are composed of three kinds of roses: white, yellow, and red. They are the elite among the students.
There is a habit in Zailian High School that every freshman will be chosen as a younger sister by the second-year seniors, and Zizai, Rimi, and Akira Chishima were chosen as younger sisters by the three seniors of the Rose family, thus starting a series of stories.