Volume 21 continues exploring the world beyond the walls, focusing on Marley and its military forces. New characters are introduced, offering a different perspective on the ongoing war. The cycle of hatred between nations becomes painfully clear. Young soldiers are trained and sent into battle, mirroring the suffering seen earlier in the series. The story challenges readers to question who the real enemy is. Eren’s influence grows even from a distance. Political manipulation and propaganda play major roles. The tension builds steadily toward an inevitable confrontation. Themes of inherited conflict and lost innocence dominate the narrative. This volume deepens the complexity of the series and prepares for an explosive clash ahead.