The film also jettisons the manga’s core themes: the cyclical nature of violence, the dehumanization of enemies, and the corruption of authority. What remains is a generic “humanity fights monsters” plot, peppered with cheap shock value—such as a gratuitous and infamous “Titan vomiting” scene—that mistakes gore for gravitas. The social commentary that elevated Attack on Titan into a modern parable is replaced by hollow action beats.

However, the film’s relationship with its source material is its undoing. In an attempt to streamline the narrative, the screenwriters stripped away almost all psychological complexity. Haruma Miura’s Eren Yeager is reduced from a rage-filled, traumatized idealist to a standard shonen hothead, lacking the haunting drive that defines the character. More egregious is the treatment of Mikasa (Kiko Mizuhara). Stripped of her stoic agency and coded as a purely emotional, love-driven heroine, she becomes a passive damsel rather than humanity’s deadliest soldier.

Here is that essay: Introduction