Hakusenkan Gakuen High School, where the protagonist, Hanazono Hikari, attends, has a placement system. It has 6 streamed classes from A to F. Class A consists of the top 7 students and are admired by the other students. Of all A classes, from the first to the third grade, the most highly regarded class is called S.A, short for “Special A”. The students of S.A, the elite of elites, get special treatment; they wear special uniforms and study in a separate school building called “the paradise on campus”.The seven students of S.A are: Hanazono Hikari, Takishime Kei, Todo Akira, Karino Tadashi, Yamamoto Megumi, Yamamoto Jun, and Tuji Ryu. Hikari is a hard worker. While the other students are children of rich families, she is raised in a common family. She attends this elite school in order to avenge her loss to Kei in a wrestling match when she was 6 years old. She thinks of Kei as a rival and continues challenging Kei. However, she cannot beat him at any endeavour and always finishes in second place.