Touma Kamijou faces relentless challenges as tensions escalate in Academy City between the opposing science and magic factions, potentially sparking a worldwide conflict with the Roman Catholic Church. Amidst the looming threat of war, Touma must step up once more to defend his comrades and prevent catastrophe. As the concluding chapter of the saga unfolds, Toaru Majutsu no Index III follows Touma, Accelerator, and the enigmatic Level 0 Shiage Hamazura on their distinct paths towards the climactic finale of the original light novel series.