Located in the Musashino private Lilian Girls' Academy on the outskirts of Tokyo, there are elegant and lovely young ladies from famous families. Their noble beliefs make every move of the ladies full of intellectual charm. Miss Akashi Rina, a first-year junior high school student who has just entered middle school, is an intellectual and beautiful high school girl. Even though it is her first day of school, she is troubled by many requests from senior students with the goal of "wanting to be with her for the next three years." She is a well-known celebrity among the first-year students. However, this well-known eldest lady had her own opinions on [sister selection]. With a smile, she rejected those seniors who could not even pronounce their names...
The heroine Akashi Rina is in the first grade of junior high school when she is 14 years old. The story of Teiko begins when she is in the second grade of junior high school. Her brother Akashi Seijuro is 15 years old.