5. Declaration of War

Complete story — includes the ending

In a theatrical presentation, Willy tells the well-known story of Marley's hero Helos, who defeated the Eldian King Fritz, securing peace for Marley at the price of Eldians' freedom. Willy then reveals it was King Fritz himself who ended the Great Titan War by fabricating the Helos myth, as he longed for peace. Believing Eldians were sinners, Fritz moved hundreds of Eldians to Paradis, built the Walls, and passed his ideology down in his bloodline via his oath, keeping his successors bound to his renouncement of war, unable to use the Founding Titan. Fritz warned he'd release the millions of Colossal Titans in the Walls – a violent "Rumbling" that would end humanity – if Marley threatened them. Willy announces that the Founding Titan was stolen by Eren Jaeger, making him a threat to world peace as he is not bound by Fritz's oath, not being of Fritz' bloodline. In the basement, Eren tells Reiner that he infiltrated Marley to save his home and realized that Paradis and Marley are alike in that both sides are just people. Reiner breaks down, devastated about what he caused on Paradis four years prior. As Willy declares war on the Eldians of Paradis, Eren transforms into the Attack Titan, throwing Willy's mangled body into the air.