Makino Tsukushi is the only ordinary student at Eitoku Academy, an elite high school ruled by the F4—four ultra-rich, handsome, and arrogant young men led by the intimidating Domyoji Tsukasa. When Makino stands up to Domyoji to defend a friend, she becomes the target of the school's brutal bullying system, symbolized by the infamous red card. Instead of breaking under the pressure, Makino fights back with fierce resilience, unexpectedly catching the attention of both the gentle-hearted F4 member Hanazawa Rui and the temperamental Domyoji himself, sparking a tumultuous and iconic romance.