Turning against his former allies and enemies alike, Eren Yeager sets a disastrous plan in motion. Under the guidance of the Beast Titan, Zeke, Eren takes extreme measures to end the ancient conflict between Marley and Eldia - but his true intentions remain a mystery. Delving deep into his family's past, Eren fights to control his own destiny.

Meanwhile, the long-feuding nations of Marley and Eldia utilize both soldiers and Titans in a brutal race to eliminate the other. Reiner Braun uses his own powers in a desperate bid to hold off Eren's own militaristic force, and his fellow Eldia children Falco Grice and Gabi Braun struggle to survive in the unfolding chaos.