Ikki Kurogane aspires to become a "Magic Knight"—one who can transform their soul into a magic sword. However, due to his lack of magical talent, he is mockingly called the "Worst One" by others. Yet, his life at the academy takes a dramatic turn when he encounters Stella Vermillion, a foreign princess and the renowned, strongest "A-Rank Knight." Meanwhile, the former "Worst One" begins to make his mark in the battle for supremacy among knights, now under the title of "Another One"—the Uncrowned Sword King!