Haruko Nanase had always been at the bottom of her class since elementary school, for that reason her classmates laughed at her, leaving young Haruko depressed. However, while she was in middle school a kind teacher gave her the strength to try again and, with this new motivation, Haruko tried again until, eventually, her hard work paid off and she reached the top.

Having now entered Shuutoku High (a private school known for the students' intellectual abilities) as the top student, Haruko’s quiet days reach an end when she meets Chiharu Hachiya, a delinquent who was able to enter the school through connections despite his absurdly bad grades, on the train. After a bumpy start, the two grow closer as they reveal their nature to the other.