Books (novels and essays) Japanese literature> Boys in Group B

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Japanese literature
Group B - Ordinary students who are neither A (conspicuous) nor C (0 presence).
In junior high school, Ryo Sakuragi belonged to Group A, a group of delinquent students. She was disgusted with such a life, and in high school, she blended into Group B in order to live peacefully.
However, Ryo took it seriously and saved her from being a delinquent, with Erika Fujimoto, a beautiful girl from Group A.
With the addition of her friends who are all addicted to each other, Ryo's quiet daily life is completely changed to an emergency situation that attracts the attention of the school!
What is the story of the awkward love between Ryo and Erika, who are attracted to each other?