After Kamijou Touma's pivotal victory in the Third World War, his mysterious disappearance reshapes the balance of power. With the Magic Side regrouping for their Sabbath, Academy City's strongest Level 5 Esper Accelerator seizes redemption—abandoning the "Darkness" to build a tranquil existence with Last Order and Misaka Worst, finally free from GROUP's grasp. Former Dark Side operatives discover lasting peace as Hamazura Shiage reunites with Kinuhata, Takitsubo, and Mugino to establish a new ITEM. Their hard-earned serenity shatters when a sinister "first year student" emerges, threatening everything the alumni have fought to reclaim. Kamachi-Sensei's latest installment in the beloved Toaru Majutsu no Index franchise presents entirely new premises and revolutionary battle dynamics, delivering a fresh chapter that revitalizes the series with bold storytelling and unexpected twists.