Eren Yeager has activated the Rumbling, sending hundreds of colossal Wall Titans marching toward the continent of Marley to exterminate all life beyond Paradis. To stop him, Armin Arlert, Mikasa Ackermann, and Levi Ackermann cross former enemy lines and form a coalition with Reiner Braun and the surviving Marleyan Warriors. Aboard a flying boat, the alliance races to intercept Eren before the Titans reach the shore. These two TV specials conclude the fourth and final season of Attack on Titan.