In the tumultuous setting of Suzuran High School, known for its unruly students, the story of 'Worst' unfolds, centering on Hana Tsukishima, a new student hailing from a quiet countryside. Despite his kind nature, Hana proves to be a formidable fighter, aiming to become the top 'bancho' of Suzuran. With the help of loyal friends and older students inspired by his resolve, he seeks to bring order to the chaotic school by overcoming all challengers, whether internal rivals or external foes from rival institutions.