Makino Tsukushi is poor, ordinary, and very much out of place at the absurdly prestigious Eitoku Gakuen. Her only plan is to keep her head down for her last two years and get out. That plan ends the day she stands up for her friend against the F4 — the four most powerful and wealthy boys in the school, who rule it through a system of social terror. The F4's response is the red card: an official Declaration of War that turns the entire student body against her. But Makino refuses to give in, and as she resists, she begins to see a different side of one of the F4 — the quiet and distant Hanazawa Rui — while discovering that the group she thought she understood is more complicated than it appeared.