Makino Tsukushi, a young girl from a poor family, is determined to navigate her final two years at Eitoku Gakuen without drawing attention to herself. However, after standing up for her friend to the school's elite group, the F4, she becomes a target for their disdain. Led by the charismatic and powerful Hanazawa Rui, the F4 issue her a "red card," a declaration of war. Despite their wealth and influence, Makino refuses to back down and finds herself developing feelings for Rui. As she delves deeper into the lives of the F4, she begins to uncover the complexities and insecurities behind their charming facades, challenging her own perceptions and the social hierarchy of the school.