Makino Tsukushi, hailing from a humble background, aims to navigate her final two years at Eitoku Gakuen discreetly. However, her life takes a dramatic turn when she stands up to the F4, a group of elite and affluent boys, to defend her friend. This defiance earns her the ominous 'red card,' marking the beginning of a fierce rivalry. Refusing to back down, she finds herself drawn to Hanazawa Rui, one of the F4 members, and begins to uncover hidden depths beneath their facades.