Attack on Titan volume 23 features story and art by Hajime Isayama.

The truth revealed through the memories in Grisha's journals shakes all of Eren's deepest beliefs. There is no rugged but free land beyond the Walls—there is a whole other world, equally full of oppression and war. Suddenly, the ambitions that have animated the Survey Corps for generations seem small and naïve. What is there left to fight for?