"Amakusa-Style Tactics" (天草式戦術 Amakusa-shiki Senjutsu?) is the fiftieth chapter of the Toaru Majutsu no Index manga series.
Touma meets Orsola and soon after a fierce battle with members of the Amakusa begins. The Imagine Breaker becomes useless against the unorthodox style of magic of the Amakusa, and Touma is forced to join forces with Stiyl to win. After the fight, a shocking truth is revealed.