At Hagun Academy, students known as Blazers manipulate their souls into supernatural weapons called Devices. Ikki Kurogane is labeled the "Worst One" due to his magic-less status and tragic noble lineage. Everything shifts when he encounters Stella Vermillion, a prodigy princess from a foreign empire and an A-rank Blazer, practicing in secret. After witnessing Ikki’s incredible swordsmanship—mastered through sheer discipline to overcome his physical limitations—Stella grows to respect him, and the two forge a deep bond, eventually becoming roommates and lovers.To silence his elitist academy and prove his worth, Ikki sets his sights on the Seven Star Sword Art Festival, a prestigious national tournament. However, the corrupt
student council president, Kurono Shinguji, imposes a ruthless condition: Ikki must win every single preliminary match. If he loses even once, he will be permanently expelled, denied the right to ever compete, and stripped of his dream to become a true Mage-Knight.As the tournament qualifiers begin, Ikki faces a gauntlet of formidable adversaries who seek to exploit his perceived weakness. He defeats Shizuku, his possessive younger sister and a powerful water-manipulator, in a brutal sibling showdown that forces them both to acknowledge their true strengths. Next, he outsmarts Nene Sekka, an experienced teacher and master illusionist. Through every trial, Ikki relies not on mana, but on Blade Steal—a technique allowing him to analyze, copy, and master an opponent's secret moves after seeing them just once—coupled with his ultimate move, Itto Shura, which breaks his body's natural limiter to unleash god-like speed and power for one minute.Simultaneously, Stella battles her own demons, fighting powerful peers like the telekinetic student council vice-president, Toya Kihara, while struggling to control her immense magical output. As Ikki and Stella conquer the preliminary rounds, a sinister conspiracy unravels
behind the scenes. Rival factions and corrupt officials attempt to rig the tournament, kidnapping Stella and framing Ikki to derail their ascendance. The climax centers on their daring rescue mission and Ikki’s grueling final preliminary match against the lethal assassin and sword-master, Ayase Ayatsuji's tormentor, Kuraudo Kurashiki. Overcoming agonizing physical trauma, betrayal, and institutional prejudice, Ikki secures his victory, proving that hard work can triumph over innate talent. Hand in hand, Ikki and Stella finally earn their rightful places at the Seven Star Sword Art Festival, ready to face the nation's strongest Blazers together.